Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8061813a7d1a411…

MALICIOUS

PDF

83.7 KB Created: 2021-02-26 12:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 09829eeb03de1fa68fe2295cf34bf9d5 SHA-1: 42909a7ac28dd87cbb8ce9d90a45a2a9e48db3fb SHA-256: b8061813a7d1a4118c543797cc171ee0bb683bccb297dd4d9017cbb7a563d412
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which are disposable or associated with link farms. This behavior is indicative of a link farm or SEO spamming technique, potentially used to distribute malware or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=gva+property+management+jobs PDF link annotation
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/efd94cac26f8c18.pdfIn PDF document text
    • http://cardio-active.site/free_metaphysics_booksd68q1.pdfIn PDF document text
    • http://pivowave.iblogger.org/96829497223.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/9gcgicg/digiday_podcast_host.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/tupeliruguma.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/fGNANMV/49441546175.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/josuguxomopoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/iatQCvu/79849597192.pdfIn PDF document text
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/01652080845cf.pdfIn PDF document text
    • http://kufigada.22web.org/avaya_phone_manual_model_1408d02a-003.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/jhchi5M/63909324087.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/qhihcjf/cyberfoot_2015_all_leagues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_6026a4b5bd629.pdfIn PDF document text
    • http://rerubin.space/botoxizip31tb.pdfIn PDF document text
    • http://pawaridifos.iblogger.org/toluwuzadezaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386595/normal_5fe0babf67472.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/f56b9c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunefukovamin.rf.gd/completing_the_square_worksheet_2_answers.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/8512367832.pdfIn PDF document text
    • http://rozevilamires.rf.gd/1095131181.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_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 5516 bytes
SHA-256: 6c5ba187ef3475ccfe3c5e18e26b2b9c8033766cfe8c61b8faf17ae8c6af6ccb
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10684 bytes
SHA-256: 6380700a09548d0104024bb08c3e4e628bcae183b972be1c046776c3b5f78d1e

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