Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a501fc57ead641…

MALICIOUS

PDF

79.3 KB Created: 2021-04-16 08:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d28e4eff37cc90d497676cbb0d55211 SHA-1: e91b30d915dc3cfa014f441550765c389897cf3a SHA-256: 43a501fc57ead64131d26b7b7e1da8f6d5b9f24793f1e23e61f9f5738ef384a0
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=how+to+pair+a+soundlogic+speaker PDF link annotation
    • http://morj.space/fuxoxefawatwg2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60209b698a495.pdfIn PDF document text
    • http://supermagazforsale1.xyz/desoxisimixijkmkb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6026d14e0a5eb.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/gehcwAU/2_player_tank_games_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/rhfjcRo/jezuvapemukiriliwola.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/4898484.pdfIn PDF document text
    • http://wejnpowk.space/monster_hunter_world_pc_guide_booklbx7a.pdfIn PDF document text
    • https://wuvalarovujed.weebly.com/uploads/1/3/4/2/134266489/3430260.pdfIn PDF document text
    • http://b4shop.icu/848171993315b057.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/Ogdjiha/live_streaming_news_free.pdfIn PDF document text
    • http://hhizmet.com/simple_literature_review_example2vy3t.pdfIn PDF document text
    • http://itanto.space/zirajulirarndvcl.pdfIn PDF document text
    • http://zalavsky.ru/21414353035ix76s.pdfIn PDF document text
    • http://copyrightnotices-form.com/dnd_5e_gunslingerdulfv.pdfIn PDF document text
    • http://snail-case.store/nipedebequqec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5fe8e397f3639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_560bdb71c5784640abb09510c1b07d3a.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_cfff4dd9ff8340b296fd8cb073906e65.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_b43cc3ee1bee47b2b77f0fe73eaa6514.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_c4f564df938d44938777d1e719b07fbc.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_bf24aefe4c9a4532a67652d225fda79c.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 5240 bytes
SHA-256: 1804b9e3eb6ac9eb9d7474c1d3f44ef5568cdcf0a37bb6f95c109f7395c2eba4
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 10632 bytes
SHA-256: bf6f7121af5ec2fd8ab17ae6c320c454757abad358e82e10fbaee436382d0f02
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e