Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9848a960ed625a…

MALICIOUS

PDF

92.5 KB Created: 2021-05-08 16:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b81220b18fa350d83bd41add34f00be1 SHA-1: 2885edd4651c677aca92d201042e82f5e2e7f109 SHA-256: 5f9848a960ed625a0ebcef7a5b3ea3d64d1daf9140d385819d39f4ad03548108
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting and utilizing UTM parameters, which is characteristic of link farm or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=super+sad+true+love+story+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6063d4cb56490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_601d837429248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_6069b9c598fe2.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/ecs_cancellation_letter_format_in_word.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/hIWufjj/best_free_slots_game_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_60498b4b54f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_604d31104c235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_605272f3150ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcf2f722390a.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/gfTgeja/youtube_video_downloader_software_for_chrome.pdfIn PDF document text
    • https://cdn.sqhk.co/taguvomir/oigigX4/21162375422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_601212894b716.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://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_6965f054717e4b4ca959a091594a5812.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_4720fc13e0bf4db286d8a2607d60f0b7.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_a5041484fb5c4e39a734d6d2e498e171.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_5ca3ebc5decc4c4eaa9da432ad1c1c91.pdf?index=trueIn PDF document text
    • http://bimokiteguzosuw.rf.gd/avast_latest_version_full_crack.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_1707fb20d4e847deb0f7da271395799a.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_daafad6f050741b1932b6d97e758b6e8.pdf?index=trueIn PDF document text
    • http://putudodizisag.epizy.com/appeasement_policy.pdfIn PDF document text
    • http://babijegogaluz.epizy.com/12a_cartridge_refilling_manual.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_f9219fa68cef4cdd9a7dc7c0199f7173.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_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 5116 bytes
SHA-256: 34307a2563c7f81b0d4eb3a4037c9b0064440afad78e6a97c7ce504254cb7369
font_01_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 11376 bytes
SHA-256: bdfcc428430cd335f43e768a73ef53322c8e7156300c31aed601f0426a7a8dca
font_02_sfnt_off0001566c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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