Malicious PDF — malware analysis report

Static analysis result for SHA-256 e615b04c83da3c28…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 18:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69c61964015548a2f4c6594d61f15299 SHA-1: 3e9e6690c0bb0f2ea3b7ee07e0139dba322750d4 SHA-256: e615b04c83da3c281b9141bf2e1577f3520fecc05d41686969da056a30717e6c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including ML and ClamAV, as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, suggesting the document's purpose is to trick the user into calling a fraudulent number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

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 https://pixomot.ru/uplcv?utm_term=can+you+send+a+live+photo+to+an+android PDF link annotation
    • https://ashleymongolia.mn/uploads/files/lakavopi.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/fotosixinuwizamufokizutas.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/4350132944.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/4830657841.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/bedavagekuzutuv.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/48914890245.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/65413685059.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/pitivuvosa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/97958393812.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/68990948603.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/valifajanunegu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/mojupufexin.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/sosovajiduvezagurawige.pdfIn PDF document text
    • http://519pf.com/userfiles/files/bibifuxosomemogaloda.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909150824.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/deramovobex.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109070908248729.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/10493529668.pdfIn PDF document text
    • http://quinta.cl/upload/files/fazudekem.pdfIn PDF document text
    • http://luatminhnghia.com/img/files/44090987762.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86462347061.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wogefa.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fikuvoga.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sewisani.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/numozebarojefa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB252 16028 bytes
SHA-256: 2c2cd3b687ef82b00cff463bf1c73932851136f87b39935d018cc29f83a83cc7
font_01_sfnt_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10800 bytes
SHA-256: 0f8ef1a47d077778288110935b6b2dbf2740318d28d29a4872ba72d3c3da3ad0