Malicious PDF — malware analysis report

Static analysis result for SHA-256 344ff5916ebe4bcf…

MALICIOUS

PDF

84.3 KB Created: 2021-05-12 22:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1daa1aea3d5b9b7278fb71e864b5467f SHA-1: 853a53c843ab641a8e4ad4697e46d8c1f4f16f2c SHA-256: 344ff5916ebe4bcf13ecd070be3100359edc31120fb827e5b3055410793b78e7
186 Risk Score

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+to+check+before+buying+second+hand+car PDF link annotation
    • http://losqutoq.online/probability_with_a_deck_of_cards_worksheet_answersk46wa.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/rurevu_sefizibije_sirum.pdfIn PDF document text
    • http://cccckkkkkdd.space/242147276463vehl.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/xezinutatire-puxemitosisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_604513a39ed1f.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/3295775.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/jelij.pdfIn PDF document text
    • https://sofotegepure.weebly.com/uploads/1/3/4/5/134522016/8047207.pdfIn PDF document text
    • http://copyright-services-us.com/power_book_2_season_1_episode_2_castr7v8d.pdfIn PDF document text
    • http://ital-tess.space/19868656980p0468.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/wulux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fe3ee415b37f.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/sufakobekuko_tafizizatev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fd8aeb2e2ad6.pdfIn PDF document text
    • http://vvinorama.fun/scientific_workplace_macwrmr7.pdfIn PDF document text
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/989a1644d3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_e1c2f5f5ba694ca8a36999ddde77fdd1.pdf?index=trueIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_c13b121da2d4484ea0d55cb14632a446.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d4348a82521042e9b961229d2f46486a.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_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 5568 bytes
SHA-256: ac8b74a099a84333c2a277ad54523d46e972e6a730dc9aafc0ae4f8857b539e3
font_01_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 12256 bytes
SHA-256: ed1089daf28109060fe39e6f94d2bd32958136d31cabb604e5e8672e82b1f732