Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b72fd1923a9841…

MALICIOUS

PDF

167.0 KB Created: 2021-03-13 21:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f7d0191198f884e49b04a8126f592ce SHA-1: 07e635472cf20ec95e7a8c003e25896f639d880f SHA-256: b1b72fd1923a98414f73936492b6cc209c5d2be0de353001a8b0ebf6c9972b63
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for brand-impersonation credential phishing targeting Facebook. It contains numerous external URIs and is structured as a link farm, suggesting it's part of a larger phishing infrastructure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used in such attacks to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/debawesabo.pdf.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/123?utm_term=axolotl+pdf+descargar PDF link annotation
    • http://bivitajuteje.mypressonline.com/what_does_pist_stand_for.pdfIn PDF document text
    • http://meriline.store/zijerijigewonizejed5uv4.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/debawesabo.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/mad_school_karachi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fda1b33eb783.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/piroxoxalukinelabasofu.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/defy_your_limits_the_telekinesis_training_method.pdfIn PDF document text
    • https://rizogedimawe.weebly.com/uploads/1/3/0/7/130739598/ruwipinaxe.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/4326989.pdfIn PDF document text
    • http://ritual-venki.online/lauryn_hill_killing_me_softly_dave_chappelle_block_party9t49j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5ff5f29557831.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/panodulalu-dimujabofuzozoz-xogopunur.pdfIn PDF document text
    • http://ukrdomonis.xyz/g-shock_rangeman_gw-9400_price2vcem.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/percy_jackson_the_sea_of_monsters_chapter_19.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/ecd4788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_2d917f04e93646b5a0f9d6afdb4f89d5.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/kisofinaroni.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_d53a369fdba2472c98d8ca2761455aaf.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_4fd7ac3318ac4520aedc77385f121d87.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2358D 3756 bytes
SHA-256: 98fb604cf8d5ec190e822a1e093d972952c9b8e7db2fe68addef2cb8386ea6d2
font_01_sfnt_off0002430a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2430A 5016 bytes
SHA-256: 8f32ada667a942406120472d6684e808a688358306dcd85ec350689c7101e6c9
font_02_sfnt_off00025435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25435 13112 bytes
SHA-256: cda329bc85c33ef53a47f940ddfdb0e76fd35135da588966ddf42f8fef83a50a
font_03_sfnt_off00027eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27ECA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378