Malicious PDF — malware analysis report

Static analysis result for SHA-256 13320a9649a274e1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-08 23:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e91ba8bd9dd00fb351c6352806407de6 SHA-1: f481edfac4d1bc338e9247a962b77407b18446a3 SHA-256: 13320a9649a274e161a61e398c0ac7f922b706633c6fd0ceb070d03e5cbace0a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, forming a link farm, with many pointing to disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Dell case study questions and answers', likely intended to trick users into clicking through to the link farm. No scripts were extracted, but the PDF structure and link farm indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/wix?keyword=dell+case+study+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/bejamisokepu/azj1ogo/coin_master_free_spins_hacks.pdfIn PDF document text
    • http://mugedly.xyz/day_to_day_english_conversation_sentences_in_officebvy5g.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/ggXieQ3/taptap_heroes_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/gujeihN/magic_piano_beat_tiles_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fdf464c0e729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_603a85c886192.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/baziwonigoripem.pdfIn PDF document text
    • http://chtotakoevuxom.biz/sample_self_assessment_essaygi1rl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_6023b227b4c80.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/9da681f9982d6.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/aojfaX2/25950270333.pdfIn PDF document text
    • http://devicesprotectionforusers.site/guzirtgqeh.pdfIn PDF document text
    • http://mscgis.net/xokapagezudopavac1pkp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5fd77a5341405.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://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_2b6d0d066cfd44acb8c19afecf40767b.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_7de34fd2131b47268d404087eeea91e2.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_a608ee745f4b47c5a40caa52c32450ad.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_b2544526fd09459fbbf27f64901cc01c.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_0e3932ae245b48a698bbb0c06f743fce.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5136 bytes
SHA-256: c73abf2e5bf0e51ab112f153568f98452ecd577a9b7569c16db53e31f09945fa
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10424 bytes
SHA-256: 2d872caa54dd934380e8fe0df5c5ba9f5dae861174151175d1120e85febb4479
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230