Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e90dee32c416b0…

MALICIOUS

PDF

82.8 KB Created: 2021-04-01 21:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c6a5d9fb8718498d884d2ae53f9014a7 SHA-1: 94e32ac23c5ef6d52d4860d7f307f4313e9f2a88 SHA-256: 70e90dee32c416b003ea879d1ac2f22bfbaf74fcf5b05f38a75dc24f3bdec0da
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that redirect to other PDF files, many hosted on disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic where users are prompted to download an archive, which is password-protected, to bypass security scans. The embedded URLs are likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/wix?keyword=apps2sd+apk+pro PDF link annotation
    • https://cdn.sqhk.co/devuzemalut/ighgiea/josapibowetaderokorudixa.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/uigpjf1/red_alert_transformers_cybertron.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/ZhdWjhh/66514231512.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/8Ogchdc/lightning_qr_scanner_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/cQCYjhx/47265317932.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/hiarcy6/wallpapers_for_phones_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/xarazoxege/jB6WRCr/class_diagram_notation.pdfIn PDF document text
    • http://neojust.ru/why_is_my_petsafe_wireless_transmitter_beepingbcw2c.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/LxkmjaN/kotifanewiladarotifexem.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/ghMgclS/speedy_cash_title_loan_requirements.pdfIn PDF document text
    • http://pixell.store/hamster_meme_template6x196.pdfIn PDF document text
    • http://usesucre.pro/479963816962gv5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/539eb905-9e44-40f1-9a32-a78fafd974dc/d_and_d_5th_edition_players_handbook_free.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_9af3fa7442f64de990f1763c9740598e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1043ec-eb6d-449f-a174-e51a89d4f1e8/how_to_cancel_lease_agreement.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_1d8d6ccf39444072b3bc15e054834624.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_aa5141405860473491c72198c646dc40.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 5104 bytes
SHA-256: ad702e8c3301d6210bdebf3a649b9aa05a1e631d43da0a8fbe5f019558a3ee1c
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 14024 bytes
SHA-256: 8655f7466678e12549b2c993d4975b7196bd25b4d5ebad7ba002eb53e8d51421
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16988 bytes
SHA-256: 2b75ed96467a42692cba4d5c8a82b36862c4b4b24342276a45b87b5eb38fa9e8