Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b02c433b1d08cf0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-22 16:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7c17ff764343bbe68bb4e7a8f0bc86fa SHA-1: c8e4bfb6e2ce6fbb64d2b648b910460b0e090906 SHA-256: 1b02c433b1d08cf0eae844c11559d26ecfbda0e458de96e71dcca8378b373c43
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring a search query related to recumbent bikes for seniors, likely a lure to a phishing site. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links on disposable hosting further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=what+is+the+best+recumbent+bike+for+seniors PDF link annotation
    • https://cdn.sqhk.co/gevolonovare/ehgejcc/1766840807.pdfIn PDF document text
    • http://ipai.online/44041571446pmqa9.pdfIn PDF document text
    • https://cdn.sqhk.co/kiranagel/hjibiel/teleological_ethics_definition.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/6fbb7.pdfIn PDF document text
    • http://vezerfa.xyz/55167194923bwx5m.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/faputusar.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/kubax.pdfIn PDF document text
    • http://cyberlife.store/rixibuwonijja9xu.pdfIn PDF document text
    • http://storeplus.pro/92754183529t5lsl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_20d91a10e5264ce99aeb428427fe2718.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_4f79d766b3aa4eaa83a727cf0e13746f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbfe774-8010-420b-829f-3389b07ce2d1/pefolokuzuwutimuv.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_c2eba2c46d9446ada55be18edbee3d00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdcb792-aa12-41ff-9cc7-d33a96a6097f/jenibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881217f7-68be-4404-896e-f542e13da719/48898574401.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/zizukemelewizaguxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326f489c-81b1-4042-bc50-8ee89045e270/89361907807.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/pixirivujufexerimemag.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/allen_bradley_plc_5_40e_manual.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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5304 bytes
SHA-256: c9698a8f465865cd3298574c7b9298d165119569a45e6e3531afefe24cbd0b46
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10440 bytes
SHA-256: b2026428b64b0812be09691005b8cd5b580c06d5b39f46607828421c364b8da5

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