Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aabf3be1928a8b5…

MALICIOUS

PDF

78.2 KB Created: 2021-04-03 09:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b2b53b8049e244e8ff9fe8814d1ba464 SHA-1: ffa8995179b011454f59eecd4bb9dce7a9cf5ba5 SHA-256: 4aabf3be1928a8b5c5b10da622a590bc9316cf5a2d3be9cc1fc360e5ee0d5d51
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm or SEO spam campaign. One prominent URL, 'https://maypoin.ru/award?keyword=ap+grama+sachivalayam+results+merit+list+pdf+download', is presented as a search result, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://maypoin.ru/award?keyword=ap+grama+sachivalayam+results+merit+list+pdf+download PDF link annotation
    • https://cdn.sqhk.co/merodobiweve/utiiif1/beach_buggy_racing_2_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_604a56dec45f8.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/uNjcPsq/farkleberry_craft_show.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/hjjjjhf/mipobegumedub.pdfIn PDF document text
    • http://tvoyoproc.fun/salezipetutsq4x.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/64349132293.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/mean_median_mode_grouped_data_example_problems.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/africana_womanism_vs_feminism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_604fa04116c0e.pdfIn PDF document text
    • http://lisolu.org/sad_alone_girl_picsh4r8m.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/aEjehM8/56095999991.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/fhcjdfo/ketudinabejubomo.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/calculus_purcell.pdfIn PDF document text
    • http://amst-watch-v2.club/elite_mobile_detailing_llc_lakeland_flufhv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6020068356f91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabegokek/84081108420.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_7bf4c502cffd494cab372a129ed03780.pdf?index=trueIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_94cd27d5684947f5b952cfd696777633.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/visiting_card_designs_free.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_22af6a953a244a9eab691bae6b879de8.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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5812 bytes
SHA-256: e7c4899b44084721baecd532f64177cab32248234b5fd4d2faa3e44c72caa129
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 11040 bytes
SHA-256: 71cd977101cd4b1b9f420730103500d644559b27d010c05b71b2d48a2917f06f

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