Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af7a75e29c17e90…

MALICIOUS

PDF

80.9 KB Created: 2021-03-13 22:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85333c59b68721fdad8fbe97811eceb SHA-1: ed3018cf52f26ccb923fa72d8201d1aefc2affd3 SHA-256: 2af7a75e29c17e90f98f5b0e26486fbad3c53860af4504597101f86d067d0e6d
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, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://resalured.ru/award?keyword=pixma+ip7220+manual+pdf
    • http://tometifo.getenjoyment.net/completing_the_square_exercises.pdf
    • http://sagedix.medianewsonline.com/lesonuxugip.pdf
    • https://cdn.sqhk.co/sewetotab/JZjhnhd/7942318534.pdf
    • http://xatulap.22web.org/pilifovodukigoriwe.pdf
    • https://puluduzi.weebly.com/uploads/1/3/1/4/131453343/9e5202e41b0dda3.pdf
    • https://cdn.sqhk.co/turaxulefa/jeiigiQ/9277105139.pdf
    • https://cdn.sqhk.co/dodirijobadi/gpifDkp/golf_battle_rush_mode_download.pdf
    • https://cdn.sqhk.co/vesagivara/f3gfggt/werewolf_cat_breed_long_hair.pdf
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60308684360de.pdf
    • https://cdn.sqhk.co/setanutoba/RJggjhb/additional_child_tax_credit_form.pdf
    • https://static.s123-cdn-static.com/uploads/4487419/normal_6000d7054a6a3.pdf
    • http://wuziwajevif.iblogger.org/how_to_convert_into_word_in_android.pdf
    • http://xudisoda.66ghz.com/83245495770.pdf
    • https://cdn.sqhk.co/sipebililofo/dtiehd1/old_school_board_games_for_sale.pdf
    • https://static.s123-cdn-static.com/uploads/4493198/normal_6000511a61d8a.pdf
    • https://cdn.sqhk.co/senuziker/jWS9Ze5/situkisejopejo.pdf
    • https://cdn.sqhk.co/xoluxuroku/dMOhgLA/7_up_pound_cake_recipe_allrecipes.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/xagoxuk.pdf
    • https://cdn.sqhk.co/bawijodol/gib1vgi/stunt_extreme_bmx_boy_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bukuzem.rf.gd/illicit_financial_flows_from_africa.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_off0000fe0e.bin
0043778514566344952b3995f6b4e5f5641e3dab25fec1568c4c23f285020b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 5336 bytes
font_01_sfnt_off0001103c.bin
dd3fb851c509611182634d1dc4d82ed2a2d6d9d3e6df9bd0312b99a25ce4fb0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 12172 bytes

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