Malicious PDF — malware analysis report

Static analysis result for SHA-256 c460d364dbbd8fa9…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 06:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1939c9c168b3990d35e72c07c646eceb SHA-1: 605edf942366a57e9d667ce8ff3f71014a90f0e4 SHA-256: c460d364dbbd8fa9349331e3496a85103cc6e377077e7bf79d71a398721ff932
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=x+wing+rogue+squadron+pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/60750155909.pdf
    • https://0286869143.com/editor_images/files/nizasipiwigepakukok.pdf
    • http://assytekservizi.com/userfiles/files/80214987609.pdf
    • http://coconut.hu/userfiles/file/82053478156.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902022436750064.pdf
    • http://bresky.cz/res/file/10585442306.pdf
    • http://rapabzenec.cz/obrazky/files/kukomubelo.pdf
    • https://luiginoiobbi.com/userfiles/file/zotikojeja.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9c2da978df9ae474dba6e8295fc34c59/60259219426.pdf
    • http://warehousetraining.ie/images/zukedetibobulinalazirijut.pdf
    • http://eviljoy.com/UserFiles/File/wulusorurezobalotibuxu.pdf
    • http://skmsm.com/userData/board/file/wojuxanutik.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/sekunikopilo.pdf
    • https://ntc-container.com/upload/files/86310564477.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xekejapinorowule.pdf
    • http://baominhlabors.com/upload/files/romasesafenikorilujep.pdf
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/72941412151.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/89177692597.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/64677685863.pdf
    • https://lodoshosting.com/calisma2/files/uploads/gifijupanutubimererukawug.pdf
    • http://qishuochem.com/siicea/userfiles/file/51388305234.pdf
    • http://kbcsisa.com/upload/fckeditor/file/80711798002.pdf
    • https://jackyrouxmethode.com/userfiles/file/25447451573.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/sozanufifuzobib.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94e.bin
f2128fe5e817fddd1ae16a9860b10d21d2d19630b8d0fec85ef6eae74b6fdea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 21160 bytes
font_01_sfnt_off00010003.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
font_02_sfnt_off00011814.bin
0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 16152 bytes
font_03_sfnt_off00012d9e.bin
e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 1840 bytes
font_04_sfnt_off00013646.bin
637809423e958662fc5e77ed3b379a59f408514c041bbea74c2bb0d149e3e921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13646 10868 bytes

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