Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43cc621494752ec…

MALICIOUS

PDF

71.7 KB Created: 2021-03-19 19:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cd6add2178762c585a0199b7ccf5561 SHA-1: 43dd775b890f19556df4c4fe928ecbaeceff7886 SHA-256: f43cc621494752ecbb25a5abc67c3f5ce1a501920485d97a60f9ec8e78ce51ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=singer+1507+manual
    • https://cdn.sqhk.co/xusarukave/hhvZ3Pz/rainbow_colored_zig_zag_lines_in_vision.pdf
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/4668978.pdf
    • https://cdn.sqhk.co/dokukavifig/joMZhcI/giziwetarime.pdf
    • https://cdn.sqhk.co/ganuniwiku/eagjhiA/incirlik_barber_shop_phone_number.pdf
    • https://cdn.sqhk.co/zovaratigu/gihgjhc/funny_hubby_memes.pdf
    • https://bemijeze.weebly.com/uploads/1/3/5/3/135302335/verifed.pdf
    • https://cdn.sqhk.co/fudamozomeb/jaicqia/medimipiw.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/6077239.pdf
    • http://cosmicgig.com/metal_gear_2_solid_snake_guide10keu.pdf
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/8957300.pdf
    • http://b4shop.icu/stinky_steve_explains_daddys_dabsetpjr.pdf
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/8859009.pdf
    • http://b4shop.icu/97034823398n9p2t.pdf
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/pobatezom-banixob-wesetuwu-mepusodufekogad.pdf
    • http://helplnstagramcontact5087423.com/57069941747t5iap.pdf
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/5363294.pdf
    • https://cdn.sqhk.co/vonirosidejo/iVyk1gd/32362743954.pdf
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/2336678.pdf
    • https://bizekexejanagiv.weebly.com/uploads/1/3/4/5/134593847/botixaresaripelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lovetijif/koxidum.pdf
    • https://s3.amazonaws.com/minaxigevani/koresulugo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c7.bin
f6488ea6993d8c22a77b0617f73ca2908efee4288d1de8b8f97a0ea5254cd84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 5328 bytes
font_01_sfnt_off0000e9e2.bin
cf564c1f07746ca5cdf42cae24b88da2cbf9ed99bda03305fd1db7ffa7b66ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 11768 bytes

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