Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f71301a2923ef7…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a2557ce35db4dbc934d78797cd6886 SHA-1: d55d8197a627f9a539b181f8b0c0c72e6285393f SHA-256: 57f71301a2923ef7181853b27fcb874b56fd7b7ea382b1acaf521a38568e5943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://golowaki.ru/wix?keyword=crossfire+mobile+apk+offline', suggests a lure related to mobile game downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=crossfire+mobile+apk+offline
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffab37260b9b.pdf
    • https://cdn-cms.f-static.net/uploads/4422144/normal_6024476b22d40.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/ff2a2953698b.pdf
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/bepupafab.pdf
    • https://cdn-cms.f-static.net/uploads/4486374/normal_6054018d37395.pdf
    • http://pigexavenume.iblogger.org/highlander_series_3_episode_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5ffe44cfa9573.pdf
    • http://feboxazatoran.22web.org/om_sri_raghavendraya_namaha_song.pdf
    • http://lumasilove.iblogger.org/how_to_make_a_gas_golf_cart_quieter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8820bd6b-bbc0-4cdc-a844-159230d10ab7/breaking_dawn_release_date_2012.pdf
    • https://uploads.strikinglycdn.com/files/1d65d51e-a1af-4d3c-9664-de1928245aac/ps_form_3602-r1_january_2020.pdf
    • https://uploads.strikinglycdn.com/files/6cfa69d3-f4b3-4bc5-9baa-b670b6dd10ae/2005_honda_odyssey_oil_change_light_reset.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_aeb1a8878f0547ae86d8e0f214c0a46d.pdf?index=true
    • http://sogaviwezed.rf.gd/wanted_poster_template_blank.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_e0e46f3e04604743921a23bc7de972f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ec9af9d-c60a-48fd-ab14-160541307ced/vanig.pdf
    • https://uploads.strikinglycdn.com/files/621279b8-5731-4c1c-9aaf-d3d92d0e61e9/chronicles_of_narnia_movies_disney_plus.pdf
    • https://uploads.strikinglycdn.com/files/df1deb85-1d29-44e3-9acd-12811ee51302/english_classical_music_instrumental.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000db6d.bin
8aa9067ce5c2fd297c7d853940d9fa38a6efc32a66829cb91ef0dd88b80a8502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 5156 bytes
font_01_sfnt_off0000ecde.bin
9597d0cfacb1586405c59850d6fa74cdc8e6416b8c2c6cb972019dd35d447361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 12312 bytes
font_02_sfnt_off000114f4.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16092 bytes

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