Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29cf81e3dc26f89…

MALICIOUS

PDF

89.5 KB Created: 2021-04-07 15:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 12f21b0b39f434a48590d13edc78cceb SHA-1: e3b3280d7fbca3ce063145ee67d97ace6b3a78a9 SHA-256: e29cf81e3dc26f891f596731a87b23f0864901814ca25439a2c04a0de56cf0a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=entry+level+qa+jobs+austin+tx PDF link annotation
    • http://dexuposi.sportsontheweb.net/milan_metro_map_2020.pdfIn PDF document text
    • http://fenellalucynelle.info/16064034222pltrv.pdfIn PDF document text
    • http://trastenmyqort.online/human_geography_textbook_onlineusunn.pdfIn PDF document text
    • http://ompala.store/64530908631zc33d.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://amandeepsadyora.com/how_do_i_get_my_panasonic_phone_to_ring_longerrkbrf.pdfIn PDF document text
    • http://ezfix.asia/sosukekurefapuluzofasbpkn.pdfIn PDF document text
    • http://fastgetme.online/a_christmas_carol_fx_release_datewsizi.pdfIn PDF document text
    • http://tersq.fun/340560880785gcgv.pdfIn PDF document text
    • http://onatural.space/99657810558posvu.pdfIn PDF document text
    • http://profaudit32.ru/mopatutyn7k.pdfIn PDF document text
    • http://pokemonrivals.online/angelcare_ac401_amazonsc4yh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/957aea7e-5a77-4cb3-b300-ad629ae8933a/70001317299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1824f4-2e28-46b8-8ba5-9829a4f24706/povabuvarovetojojugu.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/digital_oscilloscope_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d16624-6158-4c3d-98fa-e65182742544/73307496275.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/wobuxofuriteneb.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_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 5208 bytes
SHA-256: 7f9e75f30d855539482b38c3506ac33c6aa647a01dd3b087676ec01d94c0811f
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 11804 bytes
SHA-256: d3457cf6c2c6c7426744fbce15263b5b1b6b070cf0b67e0454a4cb0466dc108b