Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e87b8d3a7e8953…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 04:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: caa43ebd52fcba684dfbac31f602083a SHA-1: e57b3b63f454d39810985945ddf9451803876134 SHA-256: 46e87b8d3a7e895342f3bb89d0c16c330b424728e86415edf5c8833b9f0db58c
254 Risk Score

Malware Insights

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

The PDF contains numerous embedded links designed to create a link farm, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary malicious URL identified is https://crophysi.ru/award?keyword=solid+carbide+cutting+tools+pdf. ClamAV also detected the file as Pdf.Phishing.Trojan, further supporting its malicious nature. The document body, though heavily obfuscated, likely serves as a lure for the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=solid+carbide+cutting+tools+pdf In PDF document text
    • http://wunekixel.iblogger.org/diwukapigip.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/enfermedades_de_moluscos_bivalvos.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/how_to_know_if_your_motherboard_is_compatible_with_cpu.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/after_series_book_3.pdfIn PDF document text
    • http://disukikobofug.22web.org/66988892253.pdfIn PDF document text
    • http://miguxinam.22web.org/que_comen_el_oso_panda.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/netinuwa/article_15_full_movie_filmyhit.pdfIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_04b62f63e9d24fd491a364788856bcb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/96202522840.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/56344583218.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d66d5b85f6c84c67afd78ae9ae853347.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_284053a55aa04da2a152d071b1e65ee1.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_447825b6299544da91c70b046ac34002.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_d2a1c4b6186c400a98121224d2802ca0.pdf?index=trueIn PDF document text
    • http://nilezowavegat.rf.gd/10763349937.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_f9bd9903e0a64b2ca8bd6252f0d0b0ac.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_19bed5e4ff724a26be9c2e0224dac5c1.pdf?index=trueIn PDF document text
    • http://talagamezibupip.epizy.com/anattalakkhana_sutta_pali.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_5faee1eec5b842b49a39b285baa6835c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/khasi_gospel_video_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5568 bytes
SHA-256: 99e98ff90afcbe4bf3302b9ba0e8f3eedb178ac0c65bd5c4a0b397bee431ae74
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 11320 bytes
SHA-256: 1c3b5ab8e6e335be8d7030814e6ce2466ff38c6ae5a026407abd1184dc7102f8