Malicious PDF — malware analysis report

Static analysis result for SHA-256 a353af55bdffcc84…

MALICIOUS

PDF

76.4 KB Created: 2021-06-04 13:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3f087efb5314cdc822c33d250cd33232 SHA-1: c2a34d9cf8e54e91812be9646d6eb23d17ff322d SHA-256: a353af55bdffcc84be267fd4250857b9881e56eb3dedadda05e5ade6b02bc7e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jacksth.ru/123?utm_term=environmental+benefits+of+solar+energy+pdf PDF link annotation
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/lezoxuvol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_6060dd9e5730f.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/1315362.pdfIn PDF document text
    • https://xodobojedabime.weebly.com/uploads/1/3/4/6/134675451/b87bac60b.pdfIn PDF document text
    • https://nubitewubol.weebly.com/uploads/1/3/4/3/134385952/ropowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5ff8b9834f381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_6045f23e42482.pdfIn PDF document text
    • https://surewiseg.weebly.com/uploads/1/3/4/4/134465661/1442247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383567/normal_6006e8bbcd603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368731/normal_5fefa11b69793.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/6c983725-031c-43ef-8d7a-81c5059ec70e/how_to_set_ken_tech_clock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f106779c-841b-4e13-827e-277893a06785/disney_world_fireworks_schedule_2020_march.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b628d5b4-7bda-4618-aaa3-c430c1375b0a/wizelizipexifegotemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d0eb01-c80b-487b-96f8-4a477970bf56/im_westen_nichts_neues_film_1979_schauspieler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724d9b3a-7e44-4dcb-9a32-34ccc0a8b504/can_i_use_gimp_on_my_ipad.pdfIn PDF document text
    • http://gorixose.pbworks.com/w/file/fetch/144605790/android_sdkmanager_install_sdk_command_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47abc6a-b53e-4384-b730-0a8c5c716ffe/ritezexer.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144476652/56825855641.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144445038/muxamokugafesotewinif.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/dapefavufuxogovebawabesuf.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144594153/dragon_ball_xenoverse_2_frieza_race_attribute_build.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/f/papas_freezeria_unblocked_hooda_math.pdfIn PDF document text
    • http://zezupagijene.pbworks.com/w/file/fetch/144602688/55320919479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f256959c-cd35-4a65-9aee-60973f76d49c/76973738139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1fb6fb-22b6-4987-8b52-e4b100b009bb/78721893402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebf2aea-04c8-4ef2-8c20-714c3a38dbad/fanajufiput.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 5620 bytes
SHA-256: a51f52e3b06e388d4196286a72dbd11bb3ffbb493455ea68721e3ea6d9f7a552
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 10672 bytes
SHA-256: fb90a36bb9278c0627857b1ce8ce041474485df75ae7aea0e9d78cd7650a61bd

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