Malicious PDF — malware analysis report

Static analysis result for SHA-256 851e5231c6afc22b…

MALICIOUS

PDF

87.4 KB Created: 2021-01-09 16:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 783049fbbf645246fa314314d7128955 SHA-1: 1db8cd653abbcdf75d695e259c95b081b5e7d8a4 SHA-256: 851e5231c6afc22b3d58d04e60df31b1fa4797d0382fd152493ee7238173cf1b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one of the primary URLs points to a site offering a 'hacked version' of 'Brothers in Arms 3', suggesting a lure for users seeking unauthorized software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=brothers+in+arms+3+hacked+version PDF link annotation
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/9372825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fc7f307f01ce.pdfIn PDF document text
    • https://cdn.sqhk.co/jivapereb/gchgeGj/bang_bang_bang_bang_sohodolls_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f906a81f2397.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/Gig6igC/hay_day_pop_iosgods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fbe1b464d9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fbb928868429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff8fd22c4586.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/0WM0iqL/gujoxaliganuxedob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5fb705523bead.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/hiBIibi/egg_claw_machine.pdfIn PDF document text
    • https://konibexik.weebly.com/uploads/1/3/4/5/134515119/woref_pewuxiri_nezatasi_mitinuwi.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebejos/vemikunukonagolenerekevok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2b4ce7-56ca-49c4-9ab0-633db6ffac70/robot_crash_fight_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464f8de0-88cf-4749-bec7-5e19e408253c/39219310631.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001086e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1086E 11612 bytes
SHA-256: 198bafafd0e2cffa65ecd3ff1cbc2681bef83500a497f076a8fadb227a4c6eba
font_00_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5484 bytes
SHA-256: f661ddb4ac3e43dc61f84f6bf182efc0421c1af54a56797f6744d364172e601e
font_02_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 10636 bytes
SHA-256: 98d67b2ab6cbe3ac83336881c1f085030198f8dcc336a84ad55dfb472d1d161c

Open this report in the interactive analyzer, or submit your own file for analysis.