Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7028372f05ace8b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 14:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a337e230e28ed80df1c2e3ed75a59c87 SHA-1: daf843d9dcdefc4a3657b3b1c8e86729990d2cc3 SHA-256: d7028372f05ace8b6b9b060cdca999fbea2fbedc9e1625d3ba7380ded4e65924
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=how+to+remove+my+app+from+play+store PDF link annotation
    • http://stluciachamber.org/uploadedImages/contentImg/file/68433600419.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/73197307016.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/gadejilajigotelim.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/xetilazimo.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/buxasirarozavebi.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/zonepolabanavidobi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbbb885a22---nerubi.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/zonare.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/rulebabipubokanujiri.pdfIn PDF document text
    • http://zeci.nl/im/image/pubovi.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/1785450924.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/82471694642.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913182831.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161374129eab73---zizezoreladavudi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/839790069.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/63896440431.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/79053309944.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/47731255044.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/korufodelajiruvopitafudo.pdfIn PDF document text
    • https://doitoutdoorz.com/file/I2JVncHrHq5R6cgo.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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 17624 bytes
SHA-256: a5a49059593c00dc3285c7b485ca9682d5904ba2d19f2c5ed066467b0dc38a7e
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10580 bytes
SHA-256: c7b83367431218ee938296a5636e1bab08fee8cbe0da9964a1cc55be61f3c239

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