Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c126cc62c9b2dc…

MALICIOUS

PDF

77.3 KB Created: 2021-03-16 08:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 58e3294ac5e0396cd93a0d56dc836f9a SHA-1: 4d3a62f160dda9c16e4717271fcd3b28f8f9897b SHA-256: 10c126cc62c9b2dc6dfe297ebd49b1aeab0ea57125646e1a9cdfe823fa558913
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, many on disposable hosting, suggesting a link farm used for SEO manipulation or distributing malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body, though heavily obfuscated, contains text related to 'gstr 1' and 'information', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ponafet.ru/123?utm_term=information+about+gstr+1 PDF link annotation
    • https://cdn.sqhk.co/libavesonon/XjsANjf/capitulo_1a_realidades_1_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/hgjjZhi/19211300465.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/JsOtjfu/kudojagevubot.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/e3QjjV5/can_play_killer_dead_by_daylight_on_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/ezcjajg/bank_job_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/dhhLjdT/wakunutoxunotuba.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/geqgfhc/alliance_heroes_of_the_spire_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/MSujagi/cpanel_hotlink_protection_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/jghaqgi/victory_day_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/eijjhwU/11935346521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_3136102f14e6491da6846d46fc31177e.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_70ed0b92454544e4962f4d0c0db92b22.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_74b9d01722f040dfaca45b53ac925457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/9152007564.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_77ba2c795d8649e3a82106de5d4606de.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_513e51822a544cccb94363acf8d36a62.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_c321f0db82334c38b5d1e862d41af877.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_547c294b5f8941f2b368f3d34208a4e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/bully_dog_gt_gas_tuner_40415_manual.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e91de06cd32b459e8f40720119b9f094.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/b_pharmacy_colleges_in_andhra_pradesh.pdfIn PDF document text
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_7ddbe29773b44f33963caa0942fe239b.pdf?index=trueIn 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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 5184 bytes
SHA-256: cd79f76af3a803dc0cf0f80fdf2c73df4d83da7ee74986e92db7dabe74dbb524
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11092 bytes
SHA-256: 09304b106c5bc26f1d833e909ddac3602cc5ff0a4d9007d9624da2069ebf7110

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