Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7c9dc5667d9595…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 12:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3456499df2473d079225d6be2f59e62 SHA-1: 05b671905df1273c738d44ec72a98602e5d46704 SHA-256: 0e7c9dc5667d9595d449a308890a8c88ca8480a9a467248a8d5a7ef27ae79388
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a callback phishing lure. The document's content, though obfuscated, suggests a pretext for the user to initiate contact, likely for a scam. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/xidujutulux.pdf
    • http://kcpsystem.com/userData/board/file/12511718956.pdf
    • http://21cedu.com/pds/userfiles/files/kalijixipunedobusovafaboz.pdf
    • http://swapnakoodu.com/fck_uploads/file/nixetivudadosewogi.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/62782719172.pdf
    • http://innospectrum.eu/hirlevel/file/72041074122.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/57829463568.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6n610sp9im97d9olcej8o0nm7/56099223396.pdf
    • http://poaglasses.com/uploads/files/202109041210428789.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/68323375868.pdf
    • https://chennothinterios.com/uploads/file/70517981007.pdf
    • http://macabrey-luthier.fr/data/Files/59126296240.pdf
    • http://mofrantech.com/userfiles/file/gepovajubewuv.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6ccb810d---jamurotemaza.pdf
    • https://szabobuszrendeles.hu/files/files/95233119527.pdf
    • http://agcslohian.com/userfiles/file/17755921078.pdf
    • http://polimak.pl/userfiles/file/zevopusi.pdf
    • http://sbnjl.com/userfiles/files/83628938040.pdf
    • https://nazragame.com/calisma2/files/uploads/78486158201.pdf
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdf
    • http://yushendesign.com/images_fck/file/1630952822.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/16678717319.pdf
    • https://labelmarket.eu/data/file/gifonemixi.pdf
    • http://haihengpharm.com/upload/files/dujezunuguzetog.pdf
    • https://mimpishio2bet.com/contents/files/13885748538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=5+min+to+kill
    • 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_off0000c786.bin
6b291787d7e5f32457c89edbd4f736788e42be75e99996996925a5f60bfe41ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 20520 bytes
font_01_sfnt_off0000fbde.bin
7b69c35d9e9614ea20d4b4cb46d334164a83352a3d0856e512a36befd0447ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 9836 bytes
font_02_sfnt_off0001115c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes

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