Malicious PDF — malware analysis report

Static analysis result for SHA-256 d978a8c0eefcb37c…

MALICIOUS

PDF

94.1 KB Created: 2021-03-07 03:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41b813307f461d1f760a66b97735c43 SHA-1: 78d8b08ac4a96eaffad594e6f02f096e79850e0b SHA-256: d978a8c0eefcb37cb718e6aae6a688d0ec39291c1d8e53f032d85500ec2837ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=atwood+hot+water+heater+repair+manual
    • http://pobadabodoz.scienceontheweb.net/mayo_clinic_guide_to_a_healthy_pregnancy_2nd_edition_fully_revised_and_updated.pdf
    • http://hookup757.fun/what_do_the_colors_of_period_blood_meantuwsw.pdf
    • http://litafenedev.22web.org/mimigepedevazosefa.pdf
    • https://cdn.sqhk.co/vizinifum/hiajgsr/21492309181.pdf
    • http://ligumexijigab.getenjoyment.net/dofeselegolajirokalome.pdf
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/kewarotelanitanud.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/mubelaganikur.pdf
    • https://noloxuxema.weebly.com/uploads/1/3/1/4/131453633/zaponabubemurefiboxo.pdf
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/niketuku.pdf
    • http://wozupabalaviv.medianewsonline.com/53436344267.pdf
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/nijigajoz.pdf
    • http://normaa-id.com/functional_training_exercises_listkh1ty.pdf
    • https://cdn.sqhk.co/wofetewa/d2rR3jj/77225503508.pdf
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/4986823.pdf
    • https://cdn.sqhk.co/vekuperik/dPig5yR/motowofeduz.pdf
    • https://pisaloxonuk.weebly.com/uploads/1/3/4/3/134391291/4056361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bufezesaj.epizy.com/albert_pike_camping_arkansas.pdf
    • http://mevusajilitum.rf.gd/lavubibapoxawatunivazete.pdf
    • http://likutolejit.onlinewebshop.net/they_say_i_say_download.pdf
    • http://tikixowogozomi.epizy.com/power_pole_transformer_fuse.pdf
    • http://fuvarijes.atwebpages.com/how_to_run_a_successful_recording_studio_business.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013539.bin
baa3fd8b261ccf541a88c19ddbd9d86c545a8b1174e3831b501b2f93477f2ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13539 5104 bytes
font_01_sfnt_off0001467b.bin
f8ab5a98ffedb828b57904dd7da7b9dd4bf60fda8979076c5b6b7c151c589161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1467B 10664 bytes

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