Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e673a7065e944d…

MALICIOUS

PDF

80.9 KB Created: 2021-02-14 12:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a9f76784e24a7cf05827fbe5ae3f4b1e SHA-1: 405df46781103caa81fd1741516619ce6ffbaa07 SHA-256: 62e673a7065e944d6538ef459947f1508840cfa767a40b381b053ae66002e59a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, consistent with a link farm designed to redirect users to malicious sites. The PDF structure and embedded content suggest it is intended to lure users through deceptive content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=fertile+crescent+map+labeled PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476941/normal_601fc41ecb3ae.pdfIn PDF document text
    • http://repair-kompov.ru/52866944222pacqu.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/04f8a27d485.pdfIn PDF document text
    • http://semengergel.ru/brazil_champion_of_the_america_cup_201669m4x.pdfIn PDF document text
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/04009fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_60069376817b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_600ad887c4fc4.pdfIn PDF document text
    • https://xepudala.weebly.com/uploads/1/3/4/7/134737014/a6b29a8cf4.pdfIn PDF document text
    • http://beremoter.online/genetics_pedigree_worksheet_answerwal7w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503767/normal_5ff8cb9ca5d93.pdfIn PDF document text
    • http://bokugezus.66ghz.com/nikolilimelegafadajitadin.pdfIn PDF document text
    • http://comp-arenda.site/164952280292j87v.pdfIn PDF document text
    • http://yozi.store/panda_bear_toys_for_sale4i95m.pdfIn PDF document text
    • http://legiontry.online/138980791011z4ab.pdfIn PDF document text
    • http://prognoz-football.club/early_season_bow_hunting_tips_wisconsinu476e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_6005118d47b86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowegonuma.epizy.com/flybe_hand_luggage_guidelines.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/nufawobokutagepele.pdfIn PDF document text
    • http://lidufaz.epizy.com/pajojodezizasa.pdfIn PDF document text
    • http://puwagof.rf.gd/h_m_germany_size_guide.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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 5312 bytes
SHA-256: 843e9ce51cbf53bee7239eb81f41926fb8f5a05a45944f0bb26778a66544a244
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 10584 bytes
SHA-256: 37ad0c3b3c5cbbe9605f5e857a1eadf4f5873c03a01656832b3b39fdd1e16dac

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