Malicious PDF — malware analysis report

Static analysis result for SHA-256 616daa42769321e2…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 08:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 013dcf53f1b1a10b89a3e12de82b16db SHA-1: 28c09268bce4108ca02d0f829252c22ba53bdeeb SHA-256: 616daa42769321e2e9550470fd815f1cf041481a8782d600a33e8726b601a708
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=genetic+engineering+worksheet+tes PDF link annotation
    • https://cdn.sqhk.co/fakujodi/jhhk2hi/lg_xboom_300w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_603776617a3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601b571e3adfc.pdfIn PDF document text
    • http://itclick.info/saab_bahadar_full_hd_movie_moviescounterc1uep.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/JMgiygd/songs_of_war_movie_ming.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/hjpjahd/karibik_kreuzfahrt_mein_schiff_2021_mit_flug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6023ecf653a7c.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/a2c7ba.pdfIn PDF document text
    • http://teachersaid.fun/lowibewabowotidetilokonop0ct.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/iigjdFl/century_21_dept_store_paramus_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gAGha42/71141010526.pdfIn PDF document text
    • https://jolofoni.weebly.com/uploads/1/3/4/0/134042869/rejafikatanone.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/vosebudadovikugrnp4i.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/iltPCKe/boo_a_madea_halloween_2016_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_6063331b4c2f2.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/98399448866ft2hj.pdfIn PDF document text
    • http://ccckkkkk.space/ralesevowus3wh9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_be39fa179a6e4e049b734ed880a67792.pdf?index=trueIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_f07061df6e7241dd909b486bebcab902.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_9ae82d1595e34a2ebed6ea136fe17345.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_5ac33e8a0f024a2b8b8eabd055746126.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_1e18d2a5bdfd4290bbb0583b5032e1e9.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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 5004 bytes
SHA-256: adaa354d33fd9982817c84bc3a8df30c1d461a2a8f4eb7d7c269b40e166551eb
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11220 bytes
SHA-256: 3ed5635cd586747ec1e32bccd7e8370391fdd1d14b307a221ecf72249f49a6e2