Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a4e5a551052a1f…

MALICIOUS

PDF

87.4 KB Created: 2021-03-19 07:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 71a22554320fb7a9097f07ef723fc680 SHA-1: 635462decbd3003ff3dae8bf08a81d70ff2416d8 SHA-256: d2a4e5a551052a1f8aed95d514a38f3aac76b946d0ce4cb131457d3cd9ad03af
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=whirlpool+duet+steam+washer+and+dryer+price PDF link annotation
    • http://idealica-itufficiale.website/illuminismo_adessoxkv3x.pdfIn PDF document text
    • http://vladmer.ru/graco_duet_swing_and_bouncer_batterieso12q9.pdfIn PDF document text
    • http://keepxufi.space/thich_nhat_hanh_peace_is_every_step_deutschdbnvv.pdfIn PDF document text
    • http://lodorobirat.22web.org/xadonapegetip.pdfIn PDF document text
    • http://vudomafetamadig.iblogger.org/desumumagi.pdfIn PDF document text
    • http://tublitalia.fun/geography_quiz_questions_and_answers_hard0um7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_603bb723b718c.pdfIn PDF document text
    • http://dk-inc.xyz/15792089381l0not.pdfIn PDF document text
    • http://fastcreditcheck.info/899013465656nvge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff6ad411acde.pdfIn PDF document text
    • http://getdouche.xyz/charles_capps_youtube_healingdn0l2.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
    • http://daxevetefixidaj.epizy.com/alarm_lock_trilogy_2700_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/cadillac_ats_manual_transmission_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/vcf_file_iphone.pdfIn PDF document text
    • http://wiraxoxepopiret.rf.gd/keneforasopogek.pdfIn PDF document text
    • http://tudegelufer.rf.gd/c_h_l_ka_full_form.pdfIn PDF document text
    • http://mojebevusawibo.rf.gd/digemibog.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/aha_guidelines_pediatric_pulmonary_hypertension.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/ibps_po_mains_admit_card_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 5404 bytes
SHA-256: ec16ded8cc19c1d22b0c1ed1044d27be40cda5745045b82c7b7a03d05e7a8dfc
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 11272 bytes
SHA-256: 7d5e7843ceb56e3617465bb3cdcd46a67906346b2d89381cd8a25136cf91aeb5
font_02_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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