Malicious PDF — malware analysis report

Static analysis result for SHA-256 a975ad320646f1a3…

MALICIOUS

PDF

79.8 KB Created: 2021-03-24 14:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7cecce5ab575457010c15090f014df67 SHA-1: ea17f069dc1fb269bff6aa3ca74fd4751361d8ec SHA-256: a975ad320646f1a363886516239077138b3e371edde13b64ceffbb693ea51e90
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, indicative of a link farm or spam distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=how+to+carve+bone+in+ham+shank PDF link annotation
    • http://shortsomfj.space/764173621371f1ia.pdfIn PDF document text
    • http://crysety.xyz/5702651933y79uk.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/61597364991.pdfIn PDF document text
    • http://pe50off.pro/besidumr561.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/dakifisugudobilepe.pdfIn PDF document text
    • http://hotloveme.online/dirt_devil_stick_vacuum_cleanersv7q1b.pdfIn PDF document text
    • http://hydra.moscow/prentice_hall_united_states_history_textbooki5kny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2455a08f-84e8-46fc-beea-a46b0a1c84e8/lukuge.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_b5355daf5e0447639e7511e0efa2fc77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/147b4227-429c-4723-a14e-91b488162f40/dalefozelapukazog.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ad5bcf74a1dd453ea4986d1ac48c08af.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_f8458ee5e8014da6961b898d7a83c9e8.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_a13bf181cda84e34a01fa66fab3fc756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0d3cab-fa92-4a7d-a0bd-d363ef3ae170/48845929790.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_82c7e7864bbe45b48f195d49ac37b7c8.pdf?index=trueIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/pukeripovot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4fa875-0109-4ee4-9e8d-24bffcfb91b3/43137518300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8c94e5-a2bf-429a-884d-3470d36dc235/67055369734.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_4826200e57c545ce892a18b3da752545.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd31ad7-8294-46f3-80fd-0e97737d826f/qsc_touchmix_16_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f649fe-1309-4598-bfbe-56bc68da4a10/what_does_howl_mean_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c309503-951f-4192-8295-d0f98ef88540/boperoxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5112 bytes
SHA-256: 98644ff8def69b97f287143b5313cc887f4762665e1747e75197120ad4c46593
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 10980 bytes
SHA-256: 0965f55c72c7e77ad68c6697ec62c75e4861503f1350e2a1bf1943fac99eda5e
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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