Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97a4bced985f9ec…

MALICIOUS

PDF

76.7 KB Created: 2021-05-03 01:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 135c23dff4e32598731d9f2e4e170102 SHA-1: 214a7b053b20d4ca4e00d9de66e927bfa23603e4 SHA-256: b97a4bced985f9ec85af61d592308242371ad9ee44cb034cd4964ed2a7aa494f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The presence of a "Wii console bundle for sale" lure in the document body, combined with the high ML and ClamAV scores, strongly indicates malicious intent. The PDF likely exploits vulnerabilities or redirects users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=wii+console+bundle+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527357/normal_602830609511d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_602f223cc1026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601bfaa1cc3a4.pdfIn PDF document text
    • http://bluhgang.best/15931272979c5c48.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/9323302488.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/wugabomipijen_xixaginax_fanaxemepasig.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/cancer_de_piel_melanoma.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/castillos_de_cartn_almudena_grandes.pdfIn PDF document text
    • http://blockingscenery.com/clerical_officer_aptitude_test_2019hnads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_605ef2211f47e.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/giwufajuge.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/the_little_book_of_common_sense_investing_review.pdfIn PDF document text
    • https://rutejiredoratel.weebly.com/uploads/1/3/1/3/131383841/69c2c8cdf5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_6044220b038fa.pdfIn PDF document text
    • https://matisosu.weebly.com/uploads/1/3/2/6/132681513/mebova-dareku-wubez-sopoxir.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/58877a300826.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/fcaa2c20-5309-4da1-af9c-5b0c7b0d0e53/how_high_do_you_mount_a_55_inch_tv_on_the_wall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea2d8a9-b155-4007-91f1-c803a597b2b9/acer_gaming_laptop_nitro_5_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/serato_dj_lite_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/23490899382.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
    • 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 5168 bytes
SHA-256: 239880d54572de3848bc8fcd885409e8db2f652e101641956345e6de7bff4c1d
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10168 bytes
SHA-256: d07d83ade7194a5e9a60a8dbc1b267f05dcaef29318adb3ab72210198f902a52
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501