Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dc569ab3304fb8…

MALICIOUS

PDF

83.0 KB Created: 2021-04-27 09:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8670f820a1f8a252e95d06fa6d7f689 SHA-1: c9aa6ed7de1fe8465703ef15d1805a0ffb7d2743 SHA-256: 75dc569ab3304fb8247249542a34f6da1522cc268d7244a3e9cd9c359f5cace4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to a redirector URL, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of embedded links and the overall structure point towards an attempt to trick users into visiting a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=paparazzi+pizza+phone+number PDF link annotation
    • https://cdn.sqhk.co/vefutifeves/SihifQ5/backplane_design_guide.pdfIn PDF document text
    • https://luwomobesu.weebly.com/uploads/1/3/4/2/134235002/429b21.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ygihcja/75523987865.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jiebHhc/43961133106.pdfIn PDF document text
    • https://zirejuvisipaz.weebly.com/uploads/1/3/1/6/131636922/vidozinegumaf_pupumox_lejitadir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gumagabu/teradata_timestamp_with_timezone_format.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_dbb5599e46fe45c69e6e15563ab9a316.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/coinbase_earn_zcash_answers.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_812025fdfaeb4422beead957e5114ed6.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_a98d6a9329bd485bb826da5210d3b510.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_a4c85d9f08a844499faed3f08355fa37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/literal_equations_practice_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/dolphin_emulator_hulk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/58521539180.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/dotegomilobimuno.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/medieval_2_total_war_game_of_thrones_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/how_to_get_my_cdl_license_in_oklahoma.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/ach_mandate_form_returned.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_c75538a4a68447318a792a3bfa8cb1c6.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 5040 bytes
SHA-256: 3ad4f33487b6a133090de11241867c5b8b26dfd03241bad543815c1b6f2f1838
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 11332 bytes
SHA-256: 8e345c068e0e63b917102db615a00eb02f66e6d7cc27c2e67c8aba5fd9c7d0b7
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89