Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00e20b05311a288…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 22:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1b02a484fc47aa0450a49748ba79f16 SHA-1: a2cae8db161bff0b0e16812061dcf481a6d38c7b SHA-256: f00e20b05311a2888ab98e3218af5a6a21d28200860b0cd388531c1c81ebab4f
206 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate social engineering tactics, specifically a 'ClickFix' attack that prompts the user to run a command, and a lure for a password-protected archive. The document body is heavily obfuscated, but embedded URLs suggest a phishing or malware distribution attempt, potentially related to unlocking memory cards.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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 http://btsoft.vn/uploads/files/sarere.pdf
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/gemetemaramuvasekidisam.pdf
    • http://shimamura-mail-order.com/userfiles/file/71177133331.pdf
    • http://thanhcongtechtra.com/upload/files/19265013348.pdf
    • http://intertexmedical.com/userfiles/files/27335630519.pdf
    • http://bijverhoeven.nl/uploads/files/80258754340.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378f6468648---9490708727.pdf
    • https://searchlink.org/userfiles/file/ziwejekoperutu.pdf
    • http://motolargo.pl/userfiles/file/jotubenasoserosewedop.pdf
    • http://kindergartenhelden.at/upload/file/mefapuxajifobaxilezeva.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359019334a2---vafemudusaxazemapoza.pdf
    • http://msslink.ru/userfiles/files/93889098578.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/76892879316.pdf
    • http://phuclocvienjsc.com/uploads/image/files/luvosuvonalusabuxifuva.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79691169011.pdf
    • http://giustizianuova.it/userfiles/file/87656942237.pdf
    • http://gamjagolla.com/uploads/files/13389269857.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/zebumotimu.pdf
    • http://yujinpharma.com/upload/files/ditifenegurinibugamage.pdf
    • http://cutskytools.com/d/files/timapuxovapabile.pdf
    • http://homeopathyhongkong.org/files/47679626597.pdf
    • https://halead.com/uploadfile/1631022957.pdf
    • http://raffaelecavazzoni.com/userfiles/files/71928844664.pdf
    • http://maivietnamesecotati.com/uploads/files/ladunusileganamajab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=memory+card+password+unlocker+apk
    • 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_off0000df66.bin
9cde6f83d4030631c667c6b8ba9579faf786147dd6c71666ff14a8c3a097e9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 17264 bytes
font_01_sfnt_off00010cb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 16792 bytes
font_02_sfnt_off000124cf.bin
8513f512ec8f06bfd2167ead6745958b6038c33eeb92c038e931578f524e574d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 10872 bytes

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