Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2f1928a0eb3b69…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 09:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 902b0b2818884aecbdb2c26087a718b4 SHA-1: d6fe4333c4ed9762d2fe50de2806f71b366decf3 SHA-256: de2f1928a0eb3b69696182b64084f3970b449e2eb0e0bd107e9ef70d29d4ada4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL found, 'https://nipisod.ru/123?utm_term=bed+sheet+size+chart+in+cm', is likely part of this scheme to drive traffic or potentially host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=bed+sheet+size+chart+in+cm PDF link annotation
    • http://vexoxem.scienceontheweb.net/bruce_dickinson_biography.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/ihZicYK/skylands_pediatrics_franklin_nj.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/85626880790.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/hdihfgf/cute_wallpapers_baby_yoda.pdfIn PDF document text
    • https://cdn.sqhk.co/fusunusol/sPjchfG/facebook_marketplace_mn_brainerd.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/bgcigig/shelter_from_the_storm_lyrics_keeno.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/euthanasia_bioethics.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/96829680289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_54b2a5dc65eb420f9203799fefb0729c.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ae41b7a257b44581ba06db708ca26f95.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_4c2df7e0f4b444398f6fbb46bb072fb8.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_903f9ec179b0400a954afd5e2b343697.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_b5ec132fb760445291d0b570e06c1c4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/81781009009.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/85611757158.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/what_are_two_examples_of_psychological_hazards_in_the_workplace.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_53947bd14479467dae8f155d0d843d4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/does_corporal_punishment_deter_crime.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_f98661cb91874644b669428f92cdf449.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_654c95b5c5b241728e7edc0e0538dd67.pdf?index=trueIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_414cf06434484545948c09c0b74593fa.pdf?index=trueIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/evap_line_vs_faint_positive_blue_dye.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/aprender_ingles_gratis_basico.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/rheem_tankless_water_heater_repair.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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 5248 bytes
SHA-256: 5f1df2545dd0ae1d4fd559f6d5476ff5e8ba880cc8b0899d45458f6ab3747c58
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11292 bytes
SHA-256: 3593d887142f14ecebdd359426e8d7b8a4b7c8859b32155ab37e1a733c2e23e5

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