Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad56d3cd5c556d19…

MALICIOUS

PDF

186.5 KB Created: 2021-04-01 07:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7f270e6ade5da08f81487c84b87fcdb SHA-1: 21845d416b3957d6f8748bf5f1fd2050b789380a SHA-256: ad56d3cd5c556d192f52dbe9afc8fd4e64c9e319950d76b552b06f2d68e1e980
86 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are presented as links within a document that appears to be a technical manual. The ML classifier strongly indicates maliciousness, and the presence of multiple link farm heuristics suggests an attempt to distribute malicious content or phishing pages. No scripts were extracted, but the document's structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=avaya+partner+acs+308ec+module+manual PDF link annotation
    • http://dostafood.xyz/vijubuzaz1ksiv.pdfIn PDF document text
    • http://216tilford.com/97672182618gjlya.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/kubido.pdfIn PDF document text
    • http://saudiautoinsurance.com/76344892411ny2xt.pdfIn PDF document text
    • http://healthytrands.com/98766218521lrgum.pdfIn PDF document text
    • http://50offshop.pro/42088797727ks0v8.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/how_to_set_g_shock_ga_110.pdfIn PDF document text
    • http://ilkertr.shop/guide_d_installation_fibre_sfr0mfnp.pdfIn PDF document text
    • http://senteber.site/dark_souls_3_optional_bosses_listv7kfo.pdfIn PDF document text
    • http://damvglaz1.xyz/kafka_on_the_shoretvcgu.pdfIn PDF document text
    • http://love-your-lips.online/3047430132202u2w.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/bezomegu_falepef_rejunevu_bebuvigiso.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/93459224120zz727.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/wiwamolubolirezufomajizov.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/how_to_do_limits_with_square_roots.pdfIn PDF document text
    • http://foodguideblog.com/gelenubikijudaremekakavsfeb.pdfIn PDF document text
    • https://nitatodija.weebly.com/uploads/1/3/4/0/134012345/pudukenu.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/15_phrasal_verbs_with_meaning_and_examples.pdfIn PDF document text
    • http://on24-system.club/diploma_civil_engineering_1st_year_books6dy1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/peduwisubatuduvekedapeg.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/baidu_translate_english_to_chinese.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/sumerian_tablets_vs_bible.pdfIn PDF document text
    • http://zepomofelaj.rf.gd/42958743907.pdfIn PDF document text
    • http://zonufezago.epizy.com/ancylostoma_duodenale_adalah.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_off0002a035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A035 5868 bytes
SHA-256: 990766647664d51429f2a26f9366e748d3524676bde9874c5f4affb0f5cfa3ff
font_01_sfnt_off0002b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B422 11684 bytes
SHA-256: 96af4a1b7c9d17a8d80deb6bd2effc4694c4d5b905e6e8c8fe4c46618df6e53f

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