Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbbb6549069f2d5…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 12:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfc2ab63a36cce5e9e99a05e72762fd2 SHA-1: 207a97369271feded7755adee1a09d4da0c31bb8 SHA-256: 0bbbb6549069f2d52885120e5ca50977b71d16220de445ce330e790f91cfa2b0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external links points towards an attempt to direct users to potentially harmful content or exploit kits.

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://maypoin.ru/award?keyword=personalidad+histrionico+pdf PDF link annotation
    • https://cdn.sqhk.co/zapoboveje/cihCIhb/la_vie_en_rose_movie_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fdeffb638985.pdfIn PDF document text
    • https://mukiniga.weebly.com/uploads/1/3/4/3/134318698/xenexa.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9Xhh3ge/idle_rabbits_save_the_world_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_60581a09002e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_601885fe7101d.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/fdc5977.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/6974372.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/xgexji5/zaroziwadem.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/hijQDig/14893662681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5ff8b5ebb2592.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/9456740.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/jeOSghE/87771153379.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/bGOG5hb/hockey_legends_sports_game_mod_apk.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/c3c642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_602c376cf05cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_d26074a1fe3e447c9518d873d38d02c7.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_4fda9ba7896347618f84fd6dddb0cae2.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_62fbb99cf910445d8742417a079d0245.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_964e10ff5ea645e39efd9fd769f46412.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_fc4c053d25944efeb83c6e5174b8040a.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_92b93be13da447ccad5a24eebbf21322.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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5244 bytes
SHA-256: 8ce4ebf586e99d7f1bf2e3cef6c15ebc33ca4c89d6bef1a2336299e512c52056
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 12292 bytes
SHA-256: ca76895a1225c2e0eac60c596e2a4255e393d65d299fd89e5bbe6a01275d120a