Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf85cfde05d667a…

MALICIOUS

PDF

65.9 KB Created: 2021-03-31 22:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7ee19faea520425d60083be8288e3ff SHA-1: 940e7b69625727d42ce35339bdf9f2cf432274b7 SHA-256: ebf85cfde05d667aee63d307e977ab8feafd6fb7ac099af4d6a87752405317aa
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 0.9997

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://seumenha.ru/award?keyword=englisch+simple+past+past+perfect+%25C3%25BCbungen+pdf PDF link annotation
    • https://cdn.sqhk.co/rafawosu/jjhhRT2/soccer_heads_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_60511c92619da.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jighgeD/14555695600.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/ibichgg/save_the_marriage_vip.pdfIn PDF document text
    • https://foragiluk.weebly.com/uploads/1/3/4/3/134374590/mebasi_fitomefuxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6022efa523f9c.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/RihHqib/drive_in_theater.pdfIn PDF document text
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/8aea38edae.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ezjepjf/posumejelitofazisene.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/aVkVqib/funujosowozanagedebesiz.pdfIn PDF document text
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/darujepazipunu_bilev_saxeginoxujej.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/7wgfUw0/farovor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_603802a8a334b.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/a9394287e3a7e.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/hajdgwh/xebabob.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/risijefuj_pexiraroron_dosizig_naxatutotomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_604aa8d729050.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/d08447a3439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozifep/difference_between_jail_and_prison_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/86226631734.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/71575424076.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_off0000c2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 5784 bytes
SHA-256: 8c3800ef7dac4480392948579673921f35b6bf95e1b87e39db031a62a371011e
font_01_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 9968 bytes
SHA-256: 8ff5607eafc8d69f108ae8f4e165e2c826e8d9374b4e47476b3090e9bb3b39c9

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