Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5863074fba93d5…

MALICIOUS

PDF

81.8 KB Created: 2021-02-26 02:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9fcdd43f01ade39a9d696a9d7c0344b SHA-1: 1b545582ed0978aa8d8124de11ccd1e992d3329f SHA-256: 8f5863074fba93d504b7174e4b903a859c2aad0b9a5ec82515d8ca2f635be660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to multiple domains, many of which are disposable hosting. The embedded URLs, such as https://crophysi.ru/123?utm_term=whirlpool+top+load+washer+drain+filter+location, are likely part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=whirlpool+top+load+washer+drain+filter+location
    • http://kiritisivasol.mywebcommunity.org/how_to_build_a_weight_bench_out_of_wood.pdf
    • http://topikufovumedar.iblogger.org/68786447266.pdf
    • http://xasujaru.22web.org/93005095506.pdf
    • http://fasekafalig.scienceontheweb.net/tukata.pdf
    • https://cdn.sqhk.co/mijajijem/iDYuTij/fees_attendance_register.pdf
    • https://cdn.sqhk.co/fiporalisu/hdmDtgi/39637544303.pdf
    • http://sawemawe.mywebcommunity.org/dell_ultra_hd_4k_monitor_p2415q.pdf
    • http://dinodosum.iblogger.org/avery_8371_template_google_docs.pdf
    • https://xekobemakisusij.weebly.com/uploads/1/3/1/4/131438823/vabazawidejukujasi.pdf
    • http://dimozakebaba.scienceontheweb.net/63747818911.pdf
    • https://cdn.sqhk.co/ruxesotovo/fhhhigz/word_scramble_maker_tagalog.pdf
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/fbeb5069ac036.pdf
    • https://fixizogi.weebly.com/uploads/1/3/5/9/135959929/4b9f585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tafiwepamubov.atwebpages.com/graco_duetconnect_swing_and_bouncer_batteries.pdf
    • http://popofisofol.myartsonline.com/xuroluneza.pdf
    • http://xeregolipota.epizy.com/44599709809.pdf
    • http://rigitusavogu.epizy.com/90152732661.pdf
    • http://gebuzabode.epizy.com/wanutokafolarajej.pdf
    • http://zebowupudilo.rf.gd/dd_5e_players_handbook_alternate_cover.pdf
    • http://mugoxox.epizy.com/cox_contour_2_remote_user_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c7.bin
3648b759b65072ecf80e8509fdfe9c353d677529d3d859838ba12be59c0b5a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 5348 bytes
font_01_sfnt_off0000fa0b.bin
a631c09a9dad01ba0e7b5a31e3a24a900735451bb1e83411e00c139581a20c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10584 bytes
font_02_sfnt_off00011dfd.bin
e08c82bfb8fcedf986d7fadd95fa78fbd12be3954fc941b22011c5f54d4e5136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 17996 bytes

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