Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f34c27fb290bcf…

MALICIOUS

PDF

90.4 KB Created: 2021-06-09 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 211b6ac122290b76b39e6a5895ab3b1e SHA-1: 3984843f21f00328c84e6f35a9f6a86f31aef790 SHA-256: a1f34c27fb290bcf8f69a84bef74260052c06b9daacc051e32d0e395ac44ff99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/pbw?utm_term=mp3+song+mahi+menu+chadyo+na PDF link annotation
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/1051084.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/4c1e42.pdfIn PDF document text
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/mafajavejom.pdfIn PDF document text
    • https://nabiwadi.weebly.com/uploads/1/3/5/2/135298838/rajatuko_ximodage_jajebevukes.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/4578186.pdfIn PDF document text
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/2333754.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/derufilipoxibezodaru.pdfIn PDF document text
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/8161448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_60582894252ab.pdfIn PDF document text
    • https://gogafijunovox.weebly.com/uploads/1/3/4/3/134322332/karabodoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_603d2b9e1d261.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383138/normal_60b3e71971ea0.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/kobokunevelaz.pdfIn PDF document text
    • https://tixilumudesowor.weebly.com/uploads/1/3/6/0/136095614/sawutatukawe_texajibinet_gerowisomazojam.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406169/normal_60b2bd82e89f3.pdfIn PDF document text
    • https://lepeposozul.weebly.com/uploads/1/3/5/3/135317560/9522776.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144604056/simple_electronics_projects_for_beginners.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/how_to_study_beta_hcg_report.pdfIn PDF document text
    • http://zetewufor.pbworks.com/w/file/fetch/144803595/how_to_make_the_ball_with_rubiks_twist_snake.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/how_to_voice_chat_on_discord_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2410f14d-b668-4ba9-9c8c-3c9735a93125/where_to_put_punctuation_with_parentheses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4a1439-4362-44d7-9845-2d15ff2a4ba3/how_to_get_a_market_stall_in_spain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1526e2a-822b-4493-b630-b78ab2334d3c/zejubiwo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 2908 bytes
SHA-256: 5542cc19e044ab6c82af19d2829c9616fb7916d6c95874d36da7d014fecff153
font_01_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5432 bytes
SHA-256: 8f86a0aba042e757426c33c84e2afd634ced448731e7572e5c8c5ce1e2c0c2fa
font_02_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 11140 bytes
SHA-256: 4143e45f0299df3ee54f8494f772f28d7f26e0083e0635ced594e4f87da978cd
font_03_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 16196 bytes
SHA-256: 546594ea9f46824cb88253668d2f49be2dfd5e32c23ef0ba7662661fca5f7005
font_04_sfnt_off00013d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D29 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_05_sfnt_off00014b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2A 4132 bytes
SHA-256: c71c34fc443bd2a94acbaf011c11bc3b2ced7521adaef0101037a1202f5b8126

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