Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07b564dccc6030e…

MALICIOUS

PDF

118.5 KB Created: 2021-06-10 14:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d79a3340cbca614628037e174e54f862 SHA-1: 194be043c1160c538a07d5fbebef907725313211 SHA-256: d07b564dccc6030e8d6155cfbf130a1bf91b1787fe389586cd2fdc0f126970f6
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9997

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://philabc.ru/pbw?utm_term=adb+wipe+data+tool PDF link annotation
    • https://xurigaguk.weebly.com/uploads/1/3/4/6/134635426/nutisob_zirotiduwebew_dawuwipememute_lowifu.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/kozud.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/rogutunugaxipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_60173821efaec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fe8bd2a4aa4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_60639780aff52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_601a22ce23bd4.pdfIn PDF document text
    • https://xusegabisaxo.weebly.com/uploads/1/3/4/4/134463696/6815505.pdfIn PDF document text
    • https://gusoretudofuriv.weebly.com/uploads/1/3/4/8/134885571/naferofi_xuguxomusi_kaxepo.pdfIn PDF document text
    • https://lidajegufevu.weebly.com/uploads/1/3/5/2/135299661/2959510ca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ffb1c3f1033a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_6047bb2784bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_603a24e96d7c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_602ec05231046.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/nixevudewuledif-widimemideje-sapiduna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/f/solving_multi_step_equations_worksheet_answer_key.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144508572/asphalt_8_4.3.0j_mod_apk_anti_bank.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424647/14470124712.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/145047765/49886856251.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/36524298362.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19713 4900 bytes
SHA-256: a4e3524a3eee52bc5d37efe384eada293ba9241a9747e95d30e5974deea50354
font_01_sfnt_off0001a7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7DE 11080 bytes
SHA-256: c5ba567a28cf42179617c3098ff5854920b9aee4366ace90691e3a4a9f34f9aa