Malicious PDF — malware analysis report

Static analysis result for SHA-256 998f7c4808c0b04c…

MALICIOUS

PDF

71.7 KB Created: 2021-06-05 00:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0236de43f6209281db38415c2eb9b6aa SHA-1: 10b267740bda44f9ee8f9415e58fbdd8380c4902 SHA-256: 998f7c4808c0b04c8b9999672d2481c7771eae922c4ecf06df4d64cef566be9a
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 0.9993

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://coretry.ru/pbw?utm_term=how+to+calculate+percentage+yield+in+organic+chemistry PDF link annotation
    • https://bovipapofubamo.weebly.com/uploads/1/3/4/3/134364795/vedadiro_fafifadej.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/gazolegabuvip-pikamasupijo.pdfIn PDF document text
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/mopotavujozetobakus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_601f3bfe147b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_603cacdcb5bd5.pdfIn PDF document text
    • https://baduzizexajozej.weebly.com/uploads/1/3/4/6/134653824/tasefimarujan-gekaxuvubojiri-jesirukowuxi.pdfIn PDF document text
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/e1d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_6005590b6af69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_60676df0ef635.pdfIn PDF document text
    • https://febotagi.weebly.com/uploads/1/3/4/7/134728548/1548516.pdfIn PDF document text
    • https://supipujijasof.weebly.com/uploads/1/3/0/7/130739476/6196114.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pobonagul.pbworks.com/f/28320363819.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/97946178663.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144606297/84765413880.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144499863/75558297493.pdfIn PDF document text
    • http://jujupaw.pbworks.com/w/file/fetch/144630600/felepus.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144424299/how_to_clean_arctic_king_air_conditioner_filter.pdfIn PDF document text
    • http://sewafebi.pbworks.com/f/how_to_do_a_hard_reset_on_my_acer_laptop.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/f/lapaferimawipa.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/descargar_block_story_premium_hackeado.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/vebefenirolijogaxa.pdfIn PDF document text
    • http://faxamom.pbworks.com/w/file/fetch/144557703/ps_touch_apk_download_2020.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/21659046174.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 5644 bytes
SHA-256: 4ade9c594f2656081578a97f3bc4ceab07f6b261a14b1d4f6c54e0988b04b17c
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10664 bytes
SHA-256: c83735113c68b148c1fef18cd2d2b4e5779494b8a62c6d9d34227b0b578761c6

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