Malicious PDF — malware analysis report

Static analysis result for SHA-256 642c2b5473e6a68c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8111c837202c68f76beb7601e857edb SHA-1: aeb060ab7ab81506ce2d45084c0faf0bff897aad SHA-256: 642c2b5473e6a68ccfe51c14a8a352d7bc203c660a474403a8ca6893272065b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. It contains numerous embedded URLs, many of which appear to be part of a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://pixomot.ru/uplcv?utm_term=top+websites+to+watch+free+movies PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d98b1bbc87---gabuwibele.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/zeduwinet.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/48561115660.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/nulobaruwomisujad.pdfIn PDF document text
    • https://scalping.ir/data/files/file/54690691049.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/zizuxesunasovavosipinofa.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xoroz.pdfIn PDF document text
    • http://ruihuitax.com/files/file/povuzav.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fodewurovozanejidit.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/1600505655.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/71647343118.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/29935464295.pdfIn PDF document text
    • https://attack.lt/images/files/90051275564.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/71722853317.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/kinonisajukunasitasera.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091708430265.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/41795759336.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/patasoteli.pdfIn PDF document text
    • http://delve-cr.com/uploads/52282143313.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65841558307.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/kelorenefaf.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/nelixoxiwivosupi.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/74209533986.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_off0000accc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCC 10852 bytes
SHA-256: 7829cf14f17644695bf616383eea0d18a055b2c693d0b9c9724dcac51dcb3545
font_01_sfnt_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 14524 bytes
SHA-256: d93519bba8b42b93eb235fc1c1ff3bb62f308f45fd2d16a680bfcb8bf1c5f2c6
font_02_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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