Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4bb27de6db597e…

MALICIOUS

PDF

79.1 KB Created: 2021-05-16 19:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55d0becce4065d4ad9d53885d20e8738 SHA-1: cfd6a665295052b8d24003092a14439781c09d02 SHA-256: 5d4bb27de6db597e7f91c3b4ed214e922fd80448520f8e9ccf7ae91cef077b50
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though partially corrupted, appears to be a lure related to salary information, which is a common tactic for phishing or malware distribution.

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://maypoin.ru/strik?utm_term=how+much+do+electrical+engineers+earn+per+month PDF link annotation
    • https://cdn.sqhk.co/mirofifuba/hhifGmd/tidin.pdfIn PDF document text
    • http://uscreditcheck.info/how_to_reset_polk_magnifi_soundbarxyt7i.pdfIn PDF document text
    • http://ecosbor.net/dubazamulagkepaf.pdfIn PDF document text
    • https://cdn.sqhk.co/litazujizime/aijgejg/23036328376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_601d261b6d2ba.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/mBNbVha/crowdsourcing_vs_crowdfunding.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_6027deda79b49.pdfIn PDF document text
    • http://wiinorama.fun/ma_drivers_permit_testfecio.pdfIn PDF document text
    • http://prizinsta24.online/577972483pvkyf.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/Yiigghh/10142824854.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jVKmhfW/gebijogasuxojujewosus.pdfIn PDF document text
    • http://subbellassecret.com/zirewabej1djw.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/heiejjE/34858957912.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/zGihXjj/gozukezafi.pdfIn PDF document text
    • https://cdn.sqhk.co/gevanadu/hfSghoe/traffic_rider_apk_mod_dinheiro_infinito_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/ihgcIZV/wwe_battlegrounds_locker_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_6804982f44d84da8a190c8984eb17a35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f73327f-e099-4e00-a068-fbc67cf247b6/what_is_an_example_of_automatic_processing.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_3a8eb3991eb8418e9d9f2770288443eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96fca34-ca53-4f68-b72c-29347a40850e/nazusabubudunudoj.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_404dd079d0cf4280a65506f0e1c43103.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_78bf7a48dd3b4266a4ce21c7ac7ea633.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_cf009c0c4ad84c559cf5274b24f17bf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fd3f09-a8f3-4a53-9a83-f658361f2253/puzabiluzeritogutafaxewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f883405-32b4-466f-888e-c8116afef414/franklin_t9_hotspot_review.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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 5540 bytes
SHA-256: 017788bb8bedebe9e7b8d8fff809240895ba7895d4e91724eceaef9b746c0bec
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 11408 bytes
SHA-256: aef99727ed1b62ca43f9f1a1600f0b0e6d3d68822dd7236b6425d27c18ec4f09

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