Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d903d6a50c05473…

MALICIOUS

PDF

85.3 KB Created: 2021-05-25 07:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b3b6007af9fbadc2faa5c3fbc0913dc SHA-1: 7f1ec3612edd59013c49d81d3f4b49c8c53c2581 SHA-256: 9d903d6a50c0547328e026ded1e6acd75c56aa7682f4bdae7fab91887de902ee
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine rankings or distribute malware. The presence of embedded URLs further supports this, with one pointing to a suspicious domain 'dafemum.ru'. No scripts were extracted, but the overall structure and link farm heuristic point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=codes+for+skyscraper+tycoon
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/6367579.pdf
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/4a20647bf1f9ef9.pdf
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/kuremagojudoti.pdf
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/pixufekidezajurafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibasujefir/joey_graceffa_book_in_real_life.pdf
    • https://s3.amazonaws.com/mojivikapeti/pedosuderuwigexes.pdf
    • https://s3.amazonaws.com/xoguwavosuje/how_to_remove_anode_rod_from_electric_water_heater.pdf
    • https://uploads.strikinglycdn.com/files/1777ca33-748c-458f-ab3c-67232648c6a9/tiktok_fans_generator_no_human_verification.pdf
    • https://uploads.strikinglycdn.com/files/5845345e-155e-40bf-8e95-10d90ca5b92a/67483216815.pdf
    • https://s3.amazonaws.com/fezenur/sample_nonprofit_board_meeting_agenda_template.pdf
    • https://s3.amazonaws.com/genedonapubefe/6186479133.pdf
    • https://uploads.strikinglycdn.com/files/601383e7-aa44-4d80-8d1c-b7ceb8b56380/zojafufugezolejiteveteja.pdf
    • https://uploads.strikinglycdn.com/files/999810f8-3d97-4158-8c15-ba8ea1625b66/tavaxabekosugiro.pdf
    • https://s3.amazonaws.com/sojaxub/sejagukuwulawiweriziw.pdf
    • https://s3.amazonaws.com/wazagidonux/vurefaneragokutiz.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/taco_bell_burrito_fresco_calories.pdf
    • https://uploads.strikinglycdn.com/files/2f6c501e-5d09-4870-bee8-8e3e2b7743a8/samsung_6500_tv_wont_connect_to_internet.pdf
    • https://s3.amazonaws.com/zidosozawok/star_wars_novels_timeline_2019.pdf
    • https://uploads.strikinglycdn.com/files/861e9cfd-127f-442c-bcc9-330392448166/94109310231.pdf
    • https://s3.amazonaws.com/fodose/what_kind_of_sd_card_for_samsung_tablet.pdf
    • https://s3.amazonaws.com/desekusoxi/asi_hablaba_zaratustra_friedrich_nietzsche.pdf
    • https://uploads.strikinglycdn.com/files/437f2a97-4c63-46e4-94d8-1387288ef6cb/ruxubegojivaxiji.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_off0000f58b.bin
e36c97cfb396929c3a035c291f3154aad6e59b84677145ca1eea4005c3e79582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 5188 bytes
font_01_sfnt_off00010752.bin
bbb7eb1bf244290e32edba934fe780e1cc12c76a85ee23a90d589c98458944d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 12032 bytes
font_02_sfnt_off00013088.bin
1ee85d9b2018e03fb2545c7bdfd18aab3c4871b38cdebbbadf2790f840b53384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 16212 bytes

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