Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92748e1165e1b4c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-16 05:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f2b52d8d8915cf1451ff890143f34d2 SHA-1: 29544f608e9c8991155d9005fb03d84298e92af2 SHA-256: a92748e1165e1b4c0820a2d12dce309140a2174f83c966df7ce39320701a3d2b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, with a prominent one being 'https://druttle.ru/strik?utm_term=free+printable+blank+one+hundred+chart', suggesting a lure to a malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy on disposable hosting, further supporting a phishing or malware distribution intent.

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://druttle.ru/strik?utm_term=free+printable+blank+one+hundred+chart PDF link annotation
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/jijezamoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5ff00655020cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5ff32a19b2a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5fcf605fc76cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_5fe759881e572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600fffece2583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fcc02a2f255b.pdfIn PDF document text
    • http://tekaxaxiwirika.iblogger.org/pijutikavazopokadini.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/NTjfaPd/red_ball_4_games_free_download.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/zupiwedapez_zefenonozib_nogenaresuj_dokibedoxifuji.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/43f0a9ae0261b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5fcefd11b7577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_601799eaa784e.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
    • https://s3.amazonaws.com/pizivurapab/digital_photography_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/angel_broking_pvt_ltd_account_closure_form.pdfIn PDF document text
    • http://kitojob.epizy.com/zeus_iptv_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/kingspan_phenolic_pipe_insulation_data_sheet.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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 5024 bytes
SHA-256: c9f5ac322022f2ef3c11db0f363e99234113fe364c2c8bac0177452283064423
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 10000 bytes
SHA-256: c965e53dc9d8e4b4f9bad4870dbb63576b67e24db5e2e86d9dd2f6f0be58d527
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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