Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd7f4819169f54c…

MALICIOUS

PDF

70.9 KB Created: 2021-03-27 16:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 461d28069c9790b97c16643066936ef1 SHA-1: 1096927363f0083b3347f4d373c9ebdc3d173384 SHA-256: fbd7f4819169f54cf09b1c212ca49176e602ede4c943e43a4a8ddd1403f94176
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://nipisod.ru/wix?keyword=lesson+3.1+practice+a+geometry+answers+pages+107-113 PDF link annotation
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/2adf2041.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/42492609530.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/rirodejebolefe.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/44875773579.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/5678645256.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/relawafoboruzixiti.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/does_cyber_security_has_coding.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/vibatevi-muvexevevodopo-nezebiz-popuwezal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_cec9d90a04ba45f4ad7217aafc078809.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sultans_of_swing_drum_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/84315307956.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/job_application_cover_letter_sample.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/brainstorming_techniques_for_new_ideas.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_117d62c4b28a4982aa40054ae3a43180.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/73949192914.pdfIn PDF document text
    • https://f0d491a7-7d72-4eea-bbd3-72ad31f48a9a.filesusr.com/ugd/1acdab_aeaf9154916c457eb490d15ad22b5753.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_4668558741f14c59964409e74c9c3ace.pdf?index=trueIn PDF document text
    • http://pozajuw.atwebpages.com/bhagavad_gita_english.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 5856 bytes
SHA-256: ff3d295ac7d7928b6b1e785260aa21aeb31242ae3c2f1742eeebd26275820e2a
font_01_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 10308 bytes
SHA-256: 5fcf1536a1f5462057bd03ef11fde5bbe9fb78152137bb1441d3995e06bb8fc8

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