Malicious PDF — malware analysis report

Static analysis result for SHA-256 65641f3388425078…

MALICIOUS

PDF

71.9 KB Created: 2021-06-11 00:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9269d0ebeed6ed52444e4ca2e5efde45 SHA-1: 1ff377e09d864d66c6b9526082d9adc15c6bab9d SHA-256: 65641f338842507855e55b58b3646d240464caadbc5bae7cead64d4fe9aa334e
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download' button lure further supports this, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://infrive.ru/pbw?utm_term=mini+militia+k+mods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489730/normal_5fd3a2b77d92d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_6064e973daecd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fc7038d3998a.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/7433472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454825/normal_5fc94cf57ebea.pdfIn PDF document text
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/daxuvarazonuk_kuviworisimoded_duzikezew.pdfIn PDF document text
    • https://pumujeguda.weebly.com/uploads/1/3/5/3/135330988/9867960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6063e2a0e189e.pdfIn PDF document text
    • https://terekutididir.weebly.com/uploads/1/3/0/9/130969195/4103387.pdfIn PDF document text
    • https://viduturuv.weebly.com/uploads/1/3/6/0/136082320/1093248.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/fc01e460-6e0c-46c7-a9c4-dba6f5d51d51/7890286365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d5fb69-61ab-4997-a977-6545abf08d56/how_to_write_a_good_argumentative_essay_conclusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f67344-ebc5-40a1-9567-0ea80f2ece8a/totuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7762ec5a-c0c9-41f7-827f-86fbb05f3d45/90605883895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd31fbb1-63ac-4334-8126-b55b58d9185d/dark_souls_3_builds_reddit_pve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2fcb15-4932-4373-93a1-f00b31e536b3/how_to_configure_panasonic_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb15240-343b-4a51-85be-edd6309c6294/walmart_newborn_girl_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe8aa4f-eeff-421c-82a0-8be541a770f2/ponobabik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71dd7a3-a76c-4108-b45c-591bb7dae7da/blank_board_game_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950ffd3e-0fa6-4fc3-aa69-980800bf5d33/romeo_and_juliet_full_movie_free_leonardo_dicaprio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b2b436-d525-46cc-a7fd-7c0ce3c9ff75/3378926914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ece268-aecf-4013-b170-267342392414/romeo_and_juliet_meaning_of_lines.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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 4944 bytes
SHA-256: a64a4332981414d3239966c7904c4eeee38aa343cd3f66d1fec4ba2bb3525d3f
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10908 bytes
SHA-256: bcae7076f061e212a3b1eeabbe07415f8f566f9120ae135703cf4612125a0de3

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