Malicious PDF — malware analysis report

Static analysis result for SHA-256 36251bd31aeb2e3c…

MALICIOUS

PDF

76.2 KB Created: 2021-01-20 01:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9f8126a7112dbfcffbc13bab44febf86 SHA-1: b69389bb9298c6d1511fcc21de161a733223d018 SHA-256: 36251bd31aeb2e3c1a6717613c00261cb68bd450d5a52f8a155c6fad1ca6c9e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=dunlap+high+school+football PDF link annotation
    • https://cdn.sqhk.co/vuramufef/YLXgN56/31592621608.pdfIn PDF document text
    • https://site-1256069.mozfiles.com/files/1256069/michelin_guide_japan_book.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/gUUw1ub/rainbow_bubble_tea_making_tapioca_milk_pearls.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/wexulibixomaxobiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/hjbgecw/cute_hungry_piggy.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/kirobatuwu.pdfIn PDF document text
    • https://site-1177603.mozfiles.com/files/1177603/pivot_lightsaber.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/hdRBjal/human_resource_director_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/AibAchc/slots_free_play_no_deposit.pdfIn PDF document text
    • https://site-1172117.mozfiles.com/files/1172117/83306998880.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/SXjg0xR/african_hair_braiding_salon_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/ih8Yia4/avision_button_manager_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/cghNgEF/final_fantasy_7_characters_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/cnm4jcV/slot_racing_cars_toys.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/354dcc2.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/zumevapaledo.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/jjf7ggE/90567123293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajuse/auralex_subdude-_ii_subwoofer_isolation_platform.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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 5320 bytes
SHA-256: 05cd3370e9983361bd3f23639fc292a2bbe08be91bc234eb3008f0fbc40a6e69
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 11932 bytes
SHA-256: 6988eeb714419c54b9f61a70586b489d07dd39e341ee267d606b4103d9c9174f

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