Malicious PDF — malware analysis report

Static analysis result for SHA-256 308c8b0d44719f57…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 04:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 97815e0bd4053461307db84414d09767 SHA-1: 5a8c73a9f3c06dd5c6fd6882825a2d7bb9fd0d36 SHA-256: 308c8b0d44719f577b0a3f8ce111e8993bb4ea4ecfd5ef9a5524fd81eb6a6e85
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The embedded content, though heavily obfuscated, appears to be related to search engine optimization lures, further supporting the phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/wix?keyword=what+is+a+kiln+pan+used+for PDF link annotation
    • https://jibuzuku.weebly.com/uploads/1/3/0/7/130739289/5efdd76f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/DD3hfEZ/rokukekixulaxitijeveje.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/3748090.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/2ib6tjh/birilirivujoke.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/jhafZgc/rusaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/Lhijqhb/color_switch_makeup_target.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/fiijfjf/fopuguregepipikimatav.pdfIn PDF document text
    • https://cdn.sqhk.co/medijamowole/aXij24y/karefoxovivizivetatan.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/jfg4jhk/hello_kitty_nail_salon.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Agchiz5/domino_s_menu_deals_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaku/dKjf6gf/craigslist_los_angeles_apartments_koreatown.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/bupodegakurik-rixeromizuvumub-fizerodovatos-surokoganujov.pdfIn PDF document text
    • http://fukatamuvubigo.iblogger.org/51985369579.pdfIn PDF document text
    • https://ditoxinenibon.weebly.com/uploads/1/3/4/3/134324582/nuwafoxujorevuw.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jibii7s/rubuzuvomelasadolizevumem.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/518628c563590b.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/50e7d168-d75f-41d1-8e0b-5629755f2561/download_full_oxford_dictionary_free.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_6db5d52f2d5c49568bb8011a143ebb2d.pdf?index=trueIn PDF document text
    • http://naxixexofeveto.epizy.com/37618177579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69addee5-196b-4c36-bce3-b3f9e6900ea0/jijulumeluxitinuvimevik.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/wedding_title_background_hd_video_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e560ac7c-6419-477d-8a93-9242e5b394a3/38177475460.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_4daca953e2204011919a88b39013c698.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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 5204 bytes
SHA-256: 91eec4ba5e1c9c807ece61f940450c9467629bbf9a59cb1eb9892e667b6df46b
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 10764 bytes
SHA-256: 4390bc122f2a87a33c8fb5685532ab4ded79ab65755a6c4f3b2cca214fe0268f