Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba587ebb568ad0f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-09 04:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8421241c60619a1aecceb6623b629853 SHA-1: 15eb53de8e222ba7fb9b2d21f27e9c41bd1280ff SHA-256: aba587ebb568ad0fe94d5b3589f6c06851388ea8ce23e35b0e85a40b5c91df7e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=verizon+router+ip+config PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5ff1da2a35080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_6035b4d0b22a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_6016814a538ae.pdfIn PDF document text
    • http://purajegemaf.22web.org/88635059433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_606e45db9b3c4.pdfIn PDF document text
    • http://pukoruserega.22web.org/sofasexamagekanoko.pdfIn PDF document text
    • http://zuzotolifewujex.22web.org/mixiperogeperobiw.pdfIn PDF document text
    • http://vefatata.22web.org/ejercicios_de_enlaces_ionicos_y_covalentes_resueltos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_60354f8f4d6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_6065397f59a8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_b264e2e923fe40df9476f5b707aeaa41.pdf?index=trueIn PDF document text
    • http://bevojekibawe.rf.gd/what_is_developmental_milestones_in_spanish.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_4325cafbb30944b79e126d2dc81f5a8b.pdf?index=trueIn PDF document text
    • http://wafubarig.epizy.com/zombie_shooter_hack_mod_apk.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/rokarila.pdfIn PDF document text
    • http://bokatevifelu.epizy.com/asme_b_pv_code_section_ix.pdfIn PDF document text
    • http://japolowepipu.rf.gd/android_10_beta_s9_plus.pdfIn PDF document text
    • http://bisapejavi.epizy.com/sugogoliwewusowazimirevis.pdfIn PDF document text
    • http://pisidolasij.epizy.com/how_to_update_a20.pdfIn PDF document text
    • http://mixivilewajule.epizy.com/56073151866.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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 4780 bytes
SHA-256: 4251fd042e9701143bfccc30b263cb27ff401a4b043387ccb1c75313ffd13fd3
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 10664 bytes
SHA-256: b2194fb7f50cd58e581cafb630e69c4ec6e914c2ffb5d14c270813714f89b4bc

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