Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d12a26d9ad8eba3…

MALICIOUS

PDF

70.5 KB Created: 2021-03-22 00:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8036a8be1dbfa431dbf4c4c9f7a7474 SHA-1: 25852b88f89ef09e2d584696ad33c8420b2b7e68 SHA-256: 9d12a26d9ad8eba3a5f714156882b70aab45dde6821b5f3895671b4c579ef498
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary goal is to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/123?utm_term=nene+ambani+songs++now PDF link annotation
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/9301e708792b7c.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/jozikidazodugi.pdfIn PDF document text
    • https://lozoveku.weebly.com/uploads/1/3/1/4/131438804/255667a1c3c2d9.pdfIn PDF document text
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/8784382.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/1814326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_602a566347591.pdfIn PDF document text
    • https://fokurojisek.weebly.com/uploads/1/3/1/4/131438639/jiwupin.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/zukogeka-maxebo-kiteradob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fda2366ea8d7.pdfIn PDF document text
    • http://rupiwot.getenjoyment.net/59073979581.pdfIn PDF document text
    • https://puwixono.weebly.com/uploads/1/3/5/9/135957765/lenasase-veletazunimuve.pdfIn PDF document text
    • https://monotolifevi.weebly.com/uploads/1/3/4/6/134683372/92b8c337a2bf987.pdfIn PDF document text
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/bugiwekujunapojawiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc70761aa30f.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/bonew_vowofupoxuzu_zumaxivoluvo.pdfIn PDF document text
    • https://niforowekid.weebly.com/uploads/1/3/1/4/131406966/d78ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_601b6db711188.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
    • http://ralirajuz.atwebpages.com/suvefugopunapadunabiruva.pdfIn PDF document text
    • http://sakipipatepuwuf.rf.gd/16031078121.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/zefisumirofuwiwitako.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/72026107014.pdfIn PDF document text
    • http://kobizesamow.rf.gd/mandated_reporter_training_california_online.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/empire_total_war_grand_campaign_guide.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/bond_type_practice_worksheet_answer_key.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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 4784 bytes
SHA-256: 075f26e1779340ade7cbe23aa64037520f7c5078c037e51f141da72ca5771f24
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 10960 bytes
SHA-256: 137da17cd0d892619f2037c84c2c95ddf517a19f19122a9a5211dcb34f62dfb8
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c