Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a077155d90a9280…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 19:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4112ab9483e14f4fd5f0b79ae8f0e07b SHA-1: 84494d6e95106c63078bf0f4c0d8387107539585 SHA-256: 6a077155d90a9280b93d8816ffd17720d248406dcf86eba09bb5c8e669cab40a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=firestone+hearthstone+android
    • http://aihyang.com/userfiles/file/towibomebe.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89432427085.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210916212408.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/18143099503.pdf
    • http://www.pattyn360.com/upload/forum/files/basakizefemogez.pdf
    • http://wx-test.com/upload/ckimg/files/202109050420582787.pdf
    • https://aquarell.ro/userfiles/file/sufedirebo.pdf
    • http://taihegas.com/filespath/files/20210914005918.pdf
    • https://digicpictures.com/downloads/zibarunen.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/4613848711.pdf
    • https://doxity.ro/ckfinder/userfiles/files/43090532855.pdf
    • https://pernambucoimortal.com/imagens/files/perigolofajixa.pdf
    • http://vers-ma.de/userfiles/file/xadedonepa.pdf
    • http://sllight.ru/design/img/upload/file/94704364263.pdf
    • http://solamsys.com/userData/board/file/bemijokonuretulivame.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/32063368546.pdf
    • http://rem-stroymont.ru/img/file/lolimikolenotizajofis.pdf
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupesedutidegefefu.pdf
    • http://akkoryazilim.com/userfiles/file/ravameboneje.pdf
    • http://demkapi.com/resimler/files/nowotosorufas.pdf
    • https://cissud.eu/uploads/ck_editor/files/kuxajejuxagopixexof.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/suxamojitelojo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
font_01_sfnt_off000109ab.bin
a6fd5307c665f6d2f02c42486c8e6d896d94843d6ea058ac3baa8c7d0b7aea1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 10276 bytes
font_02_sfnt_off000120b6.bin
0f85c5da3019fb7bc5d21d83bb7089fd5a60225e3fdebcd153b44259193d5d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 17296 bytes

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