Malicious PDF — malware analysis report

Static analysis result for SHA-256 873315a48857d9f8…

MALICIOUS

PDF

90.7 KB Created: 2021-04-26 13:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f53279b07446b2bce46726ed635eff3 SHA-1: 9babce1a7e7d7d64832cde2fc006b260d0eb5617 SHA-256: 873315a48857d9f8eb6001279fb5085362c91e89e5dcaa2f28f340d9b41ef195
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=tabla+periodica+de+los+elementos+quimicos+con+nombres+en+ingles PDF link annotation
    • http://4kuhd.me/english_to_marathi_dictionary_appc1529.pdfIn PDF document text
    • http://card2card-perevod24.site/new_vermeer_bc1000xl_for_saledrug5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_602409cb6ae4a.pdfIn PDF document text
    • http://christinaanddavid2019.com/1883547118281tbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_60404251b7039.pdfIn PDF document text
    • http://podarokinsta.online/82596809919i11gk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419846/normal_5ffd42706d762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_b7594be3ef424906a366dbcffaef22b0.pdf?index=trueIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_20990a768e2f46a88862622f87dfc881.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40baf4f-3027-43e0-be02-f127a824eb90/76991974467.pdfIn PDF document text
    • https://196cdf53-7a38-4f80-8f5e-3ad65c24f50e.filesusr.com/ugd/e5a593_ae9428940ff041389b692f519dd8b3cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d94639-d878-4b57-bd53-b5af5239d605/how_to_make_watermelon_wine_for_dummies.pdfIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_77839d05ffba40a6a42361a40edcd474.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/sacred_geometry_artwork_for_sale.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_75060b479eca488bbf6e3846e630e6bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ce9c2b-e421-4cd3-8aa5-78e2b776c9e2/sc300_2jzgte_swap_for_sale.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_8b93bfcd44db45cda97c8f94b833aaa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/sutowa.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/broadcom_wifi_driver_for_ubuntu_14._04.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9b4c6a587f3446aab4ecdd117852a658.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e55cc1-bdd1-47de-9d0f-7418851ee163/tudilegixevuwamemuza.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_5e99b3c785d944a69c5dadeae63d6fd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0224ac-9f2d-4661-a197-d88405516679/the_burning_bridge_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/tujudoke.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/cet_application_form_correction_date_2019.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_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 5608 bytes
SHA-256: 020b0f61c2e3684fd9d437e52bcddecc869f5b41530fdff22715c2d94beb23ca
font_01_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 12756 bytes
SHA-256: faa9ada844c6561960beca291c529cf0e41ebfb03db932b3b6263a3a9bc9f497