Malicious PDF — malware analysis report

Static analysis result for SHA-256 c141169c51eb2600…

MALICIOUS

PDF

75.8 KB Created: 2021-04-09 08:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b1147db7e29236bb5c59e95ad84c17c SHA-1: 0ca1cc572f90a2b05ae021625916c1b9e323499d SHA-256: c141169c51eb260053d50a9c6376291a898e800d97b81f8a562434d1119dd5f0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the structure of the PDF point towards an attempt to exploit users' trust by presenting seemingly legitimate content that leads to harmful sites.

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.
  • 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://xezojetit.ru/strik?utm_term=how+to+put+a+hamilton+beach+microwave+on+50+power PDF link annotation
    • http://yognat.space/pepifcfexk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_606b37bdc9294.pdfIn PDF document text
    • http://dalnoboyi.xyz/28725509609hyni7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_6016b69f6b939.pdfIn PDF document text
    • http://reduslim-eu.site/how_does_god_reveal_himself_to_us_through_the_biblebtrwe.pdfIn PDF document text
    • http://ctyr.ru/sony_sa-ct260h_remote_app93x4y.pdfIn PDF document text
    • http://wwbook.org/final_fantasy_12_zodiac_age_early_game_tips9rhnd.pdfIn PDF document text
    • http://com-connexion.xyz/60586008946kvi4w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_60667e9646da2.pdfIn PDF document text
    • http://xxlmature.site/gone_with_the_wind_book_age_ratingjxzxh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_29cb2d0c28e142b1a6a31d7ceff7f142.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_80702c25ae9f499dace290fc0ad3acd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d3f161-2251-4cab-b147-096f23e96b6f/specific_weight_of_hydraulic_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caab6a5e-f2ed-415b-a0b8-f86aae9244f1/n600_netgear_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae6d428-358e-4eff-b788-b7278ec64e89/titalejefimuludisew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a11142-c28b-4a1b-841d-371e30fe4c44/weber_genesis_e-310_parts_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dcb03a-54d7-4d93-828c-ee8ce0150a22/casio_ctk_496_price_in_sri_lanka.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5516 bytes
SHA-256: 8e50ab8d6e2e4b39b405534cc95b87262144199ce544a40bebd3193d8e8c0b29
font_02_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 12000 bytes
SHA-256: b3f67b4c0b097158f662f246d91b106496ebffe94fb891e939ad9abd222e967b

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