Malicious PDF — malware analysis report

Static analysis result for SHA-256 39644d23929daf0d…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 00:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8154876314f378cda421584182dd721a SHA-1: 707340e865e09afcd833df1f7bedf36ee6901805 SHA-256: 39644d23929daf0d0dd27668fb7245b7434e2b415b8ebed1426e77df1fe012cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/123?utm_term=reading+strategies+book+by+jennifer+serravallo+pdf PDF link annotation
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/korelupagiwowuxarif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd2e6fa4f004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_60240ec12848e.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/neseja_jejovegikilabis.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/cacc9668f1aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_602155b10f926.pdfIn PDF document text
    • https://vetetomo.weebly.com/uploads/1/3/4/0/134000119/razopebifoveba-lotavonabatu-vinupewiresiro-tasilezadud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_60112bfee1d58.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
    • https://s3.amazonaws.com/zaxawetawupo/bollywood_movies_mkv_file.pdfIn PDF document text
    • http://bipurufepibega.epizy.com/13085056649.pdfIn PDF document text
    • http://gijomifede.rf.gd/h_s_s_c_answer_key_2019.pdfIn PDF document text
    • http://zozemuki.rf.gd/defenseless_corinne_michaels_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/79378346290.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/acrylic_sheet_design_for_ceiling.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 4720 bytes
SHA-256: f8f10a3b492995c76d925a3d5eee599dc58c4507276d9ecf0459d39e9463655c
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5444 bytes
SHA-256: b25295677a5c60c914f52ff879c95486fa78b83256c3e938b06eb9497b827c90
font_02_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 11104 bytes
SHA-256: 759ad569baa867dbab2ba876e9087e6ac74811ff852efba2a9fff2802ad6af12
font_03_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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