Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf71cb16823dedc…

MALICIOUS

PDF

74.9 KB Created: 2021-03-20 03:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7926c4605a2cc56f6af33b0f321476 SHA-1: d39b5231435a0465423ab07e64200fe4bd589325 SHA-256: cdf71cb16823dedc6e6d661d50e756b5f183dd995c31b645645e1fb0694eb9fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs strongly suggest this malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm indicate it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=metal+gauge+thickness+conversion+chart+pdf
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/ed1b1f3785.pdf
    • https://cdn.sqhk.co/tidaxetosi/muuhhhf/world_best_cooking_recipes_game_mod_apk.pdf
    • https://cdn.sqhk.co/senuziker/gZuahf2/81428498816.pdf
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/tobadeku.pdf
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/guvagoranomi_zunifadikak_figazalide.pdf
    • https://cdn.sqhk.co/sewadokoka/j2WYigd/radejuziwatiwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_93b2986490f84ca7ae0722833d78e8b9.pdf?index=true
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_d0299fa2cc2d4a9a8424f3d446de6185.pdf?index=true
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_d0dee7f33735473e97b54e18a70006ac.pdf?index=true
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_897661e2381e4c35b712d2a0e6a665d4.pdf?index=true
    • http://rimaxuzekinixib.epizy.com/html5_tags_list.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/dj_remix_bass_song.pdf
    • https://s3.amazonaws.com/makumapikeze/70190411715.pdf
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_905710fc939c42d8ad065ba580316cf9.pdf?index=true
    • 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_off0000e48d.bin
3369be582a7227d97eacb7997f171e7dd3d34f4e3d43e749557cd428b2122e34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 5548 bytes
font_01_sfnt_off0000f77c.bin
e078b7b30e5868a81f7d1300dffafbdbcddebbce930c3f2aac6921ba8d7d97f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 10900 bytes