Malicious PDF — malware analysis report

Static analysis result for SHA-256 f481e2ebd5a5fbb8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 02:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0a5e596c60a9f41043eb2adfb8e9748f SHA-1: a070e12b42fa95caa061b07d3fff70dcdcaacb11 SHA-256: f481e2ebd5a5fbb8271d675bc0efec891ab9f6cc99a19ca7e4eb6de72c3f0caf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ic+engine+question+bank PDF link annotation
    • http://slimerecipe.org/stock_market_books_for_beginners_freeh93id.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/gi6t0gf/39100061244.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/jjB2Tgh/tetris_99_switch_t_spin.pdfIn PDF document text
    • https://cdn.sqhk.co/noxobabidof/hibjdIK/78963264289.pdfIn PDF document text
    • https://cdn.sqhk.co/juwovatagevi/X3Wjjgd/tujigugafexa.pdfIn PDF document text
    • http://bnl-jobs.com/how_to_start_echo_cs_400id2yc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/597W7jb/jugar_star_wars_galaxy_of_heroes_en_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3a989a-b40f-42f2-8394-6c95f3b3ab10/what_is_the_purpose_of_writing_an_observation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/arroyo_landform_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d53862-61a2-415c-aa5d-da53c4b67820/pusafonomorupawonofew.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/33668070431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec40c6a-4956-4aae-aa02-b9c4121c35b9/55333254726.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/bbc_good_food_guide_shepherd_s_pie.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_cb8fd72a52f24a13b7b0a41591b3123f.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_1bca7a8542054403999a00caa9635d47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23da8c6e-dc42-472a-ae3b-744c7eec073a/7083488222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04cb5c84-fd21-4066-8d37-43b2b21bb30c/reviwis.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_b5c23bd4318941ccb82e4d317f8e6e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cefafed-c6c9-455a-b11c-e5565b62fd7a/quicksilver_3000_classic_neutral_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd52ae7-0917-4e78-970c-9d128f8201d8/atem_setup_utility_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/36351849781.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/39686348763.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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 5104 bytes
SHA-256: c507f5db9baae0ab67e89e56cdf7a6ca47e5fcd80c31c733ffe43083dc76afb2
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 11552 bytes
SHA-256: 0300ad92e09d970dfe6539aeb4048d15eab0ef782b75430549c22ca46c5a2cca