Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb5917a0885ac23…

MALICIOUS

PDF

94.9 KB Created: 2021-03-19 23:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1cfc96e84c2da43e3615c2dfd0f29c6f SHA-1: 1c98d54a8bc1665bd77aa71c45bb3be573405d78 SHA-256: 7bb5917a0885ac23bac1d8e1cf312b5d3a7429a897fed6f28bc64bb79e2fad7c
156 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 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 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.
  • 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/wix?keyword=swgoh+adaptive+f2p+guide PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemakeruw.epizy.com/jixiduruvibikudogamikitew.pdfIn PDF document text
    • http://goxafufi.rf.gd/23432695217.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_73555868e4fa469991416e3adb0f4d87.pdf?index=trueIn PDF document text
    • http://penotumupemu.epizy.com/xuberekute.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/soguzasir.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_3298ccb5b2c647629fd615e025c770c2.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_0ec51856d36b4414943c096e4166f970.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_69d7257678d849eab30f580a6933aa64.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_316122e0a58d4ab39f162c33ed772621.pdf?index=trueIn PDF document text
    • http://varezekavon.rf.gd/76688395671.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/remopivol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48c4a81-0e5c-4df2-a796-57cf5dea5229/93658164105.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/bronchiolitis_pediatric_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/christmas_card_templates_printable_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d42c5a-15c0-42b7-a8cb-542694f2c0ca/ripitevibimure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324d224d-bcc3-40e4-8c74-895fe124f100/prayer_not_to_die.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_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 5384 bytes
SHA-256: 85ebf04392c40fc8a3efec46d54bfdd851f05cbcaf6eff44d788bd59d825244f
font_01_sfnt_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 11176 bytes
SHA-256: 2ea9d2b7fd89524b310400cf4d99642321ba76766c49fce9e88d71d897d68f91

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