Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e5347b13440797…

MALICIOUS

PDF

139.5 KB Created: 2021-03-12 04:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c062ec8dd6660df68811737f54e3a8ec SHA-1: 55fa9a49b05406b946fb5dd2ccc38b44cb5837ff SHA-256: 71e5347b13440797c10c0a3aef3bab5883b977bccb30f7182895cdee95c44667
196 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 point to other PDF files, indicating a link farm or SEO abuse tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious nature of the file, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/wix?keyword=magda+eisenhardt+days+of+future+past
    • http://hightrade.club/what_is_the_best_3_quart_air_fryerezvic.pdf
    • http://train-home.ru/ximitugazedobocd6kl.pdf
    • http://pefiworawodud.mypressonline.com/2602735936.pdf
    • https://cdn.sqhk.co/xarozowuzosa/OgjTvia/build_pro_construction_inc.pdf
    • https://cdn.sqhk.co/tumokufagu/VxtYjcG/dagisofufo.pdf
    • http://mizafaroremida.getenjoyment.net/cheng_tsui_chinese_character_dictionary.pdf
    • http://tanijijud.sportsontheweb.net/dapusixorologifop.pdf
    • https://cdn.sqhk.co/rudixika/aoZ0Bih/vitulajuwixejeruzivezoxe.pdf
    • https://cdn.sqhk.co/tiwavewo/icijGRg/ultra_hd_hd_wallpapers_for_laptop_windows_10.pdf
    • http://jidokove.scienceontheweb.net/memoratu.pdf
    • http://xawamiwupajev.mygamesonline.org/14624542107.pdf
    • https://cdn.sqhk.co/lisakopew/H2okDjc/ladder_climb_race.pdf
    • https://cdn.sqhk.co/gimenuxot/hwnml54/wijozolixudujij.pdf
    • http://lozhobelir.space/why_is_being_a_pimp_illegaly5uyw.pdf
    • https://cdn.sqhk.co/xeposetuge/hdgcvC3/gafomivodigesujagejuso.pdf
    • http://how2clever.com/borges_the_aleph_and_other_stories4ijlt.pdf
    • http://zawugudumi.getenjoyment.net/xulowiramexumeburilalobax.pdf
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/ridofuninijibike.pdf
    • http://worldhold.online/how_to_reset_trane_nexia_thermostatophst.pdf
    • https://cdn.sqhk.co/bogovureg/gfjF7Hq/99471749375.pdf
    • https://pevopuxavinedun.weebly.com/uploads/1/3/1/4/131406680/3640b0.pdf
    • http://xeberok.getenjoyment.net/movuwazivelumotir.pdf
    • https://cdn.sqhk.co/watexoba/icijVjb/computer_notepad_notes.pdf
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/9759350.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nufiwimuzobo.onlinewebshop.net/34195095037.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_off0001e7fa.bin
5f883644f8c443f94f1e0cf294d6a079302e01512103d56a17d367f0914d51f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7FA 5376 bytes
font_01_sfnt_off0001fa5a.bin
ac02de565d5768e8e4cdeb26097068bf00535c4bc58adecd10ef24bbbd284dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA5A 11248 bytes

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