Malicious PDF — malware analysis report

Static analysis result for SHA-256 6687297cd1fa5abc…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 23:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 51de4a1faff4cc215eb0cd628fe36537 SHA-1: f9c7abcacafd933fc20af4d3bbaf27b463668eb4 SHA-256: 6687297cd1fa5abc18ab09fe753cd918d7e8f6c9d7a372295b73e64c01a4de12
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 0.9998

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://maypoin.ru/aws?utm_term=how+to+clean+bissell+spot+clean+pro+3624 PDF link annotation
    • http://winokuzovew.iblogger.org/first_alert_test_sequence.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_f7a96840138a4507a86897776692a1dc.pdf?index=trueIn PDF document text
    • http://jabafujadopus.rf.gd/sitavetakojasij.pdfIn PDF document text
    • http://kutegogugilavo.epizy.com/63522704248.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_cf57a92717884253994ef1327c3ad464.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_a1e5cd1240b04d098258e95078f38ed1.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_e01d07728a834608a4a44fc9fb0f1bed.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_7bfc601338344a2fbcc6e4ed206a51a1.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_4bb41a2d7d8d49c38bedab199748707b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/airlift_movie_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93181f5-ee0e-43c9-8ddc-59e105eec199/garmin_gps_128_dansk_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b71b842-af14-450a-bffe-846e16c0eecc/74004362121.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_d62d5cbb6fa2435eb9351ac287592541.pdf?index=trueIn PDF document text
    • http://bejiteviv.epizy.com/botonosigewaxizomataz.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tasajuxefev.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_9f1049f945a9478093898aa7588e89a0.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_abaa186e5bc847448e00b98ba5f4ace9.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_0758779a417646098ddaef732742dd2e.pdf?index=trueIn 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_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 5660 bytes
SHA-256: dc66d9d17efa85e2c21ac0e94738b78d09493b277c0fd36a07a707ad18069905
font_01_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 11356 bytes
SHA-256: 5e8976e488fcabd0127ef50559f361a14f158f810f39f5d25d6414b6ca181a61

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