Malicious PDF — malware analysis report

Static analysis result for SHA-256 954824c2169afb93…

MALICIOUS

PDF

70.6 KB Created: 2021-04-05 23:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 57cc5ea9c454a26a827d67083b5b6199 SHA-1: 18799388742e466859adc71bb7e6852fc8d450ff SHA-256: 954824c2169afb9300099dc3e148f97eccf49f707e30f2f38b0995e66676ab71
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve as lures to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+de+recursos+humanos+george+bohlander+scott+snell+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5ff1bd0f06f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_601324643345b.pdfIn PDF document text
    • https://bumopabir.weebly.com/uploads/1/3/4/6/134679094/9089868.pdfIn PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/7028185.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/kexalufufudasuwoz.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/nakoginulogit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_6007e707800e9.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/how_to_oil_a_montgomery_ward_sewing_machine.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/8830496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_60658063ea4b2.pdfIn PDF document text
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/14c088986e731a.pdfIn PDF document text
    • https://suligabewe.weebly.com/uploads/1/3/4/0/134040343/lonozab.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/appropriate_preposition_with_sentence.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://300a1258-3b13-45f7-80b9-bd8966f45320.filesusr.com/ugd/81888a_83016218261f4a22b5b317f49609d6a2.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_b243f377cf4d4c3787e2f524186dc07e.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_485f88888a4243f5876118e363385243.pdf?index=trueIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/canon_6d_mark_ii_manual.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_4b80ccbd337a44afa0d9254daa71907a.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_0941a8a8636a466eb72648ed6c940a4f.pdf?index=trueIn 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_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 6200 bytes
SHA-256: 593f9c5e7b4a34e20e268d9dd1be85e421e46e25a60b2d93e1fc945786b3b01e
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 13396 bytes
SHA-256: ce563353328486d9359a37ae9c6515c77bf79db7ab20dfadb6951c1c87caf399

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