Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8955c4e5c2b535…

MALICIOUS

PDF

79.8 KB Created: 2021-04-25 09:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d54d0540682be537decdd645e3b4a4 SHA-1: c707f71e6bf3a064e0d7c37a6399e6d9c6d2ea9b SHA-256: 7d8955c4e5c2b5354303d18ae5ab6726d5aeab0e74ac3944d15563a0d52225f1
156 Risk Score

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 point to other PDF files, suggesting a link farm designed to manipulate search engine results. One of the primary external links, https://maypoin.ru/strik?utm_term=cuisinart+dcc-3000+coffee-on-demand+12-cup+programmable+coffeemaker+manual, appears to be a lure for users searching for a specific product manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=cuisinart+dcc-3000+coffee-on-demand+12-cup+programmable+coffeemaker+manual
    • https://static.s123-cdn-static.com/uploads/4451932/normal_5fde68c43c9c6.pdf
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/6601065.pdf
    • http://julivojurukumu.sportsontheweb.net/632545911.pdf
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fdf5417e93de.pdf
    • http://xogakijukutikep.22web.org/kisiretorulirowit.pdf
    • https://cdn-cms.f-static.net/uploads/4486045/normal_605a0c061566a.pdf
    • https://cdn-cms.f-static.net/uploads/4454670/normal_603c7164594c4.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fea0aa11db12.pdf
    • https://cdn-cms.f-static.net/uploads/4481068/normal_60511bff33e29.pdf
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/kijizubarepiraverafa.pdf
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/muxidodigerox.pdf
    • https://dewifekezag.weebly.com/uploads/1/3/5/3/135313931/5431856.pdf
    • http://lumogodasekepi.mypressonline.com/retinosis_pigmentaria_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4481411/normal_60451e1575da9.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/wezexapipotimup.pdf
    • https://cdn-cms.f-static.net/uploads/4426819/normal_6017d4e4eb873.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_6035f0861f3db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f887a587-43a6-4a8b-bf2e-9bc7ad2cedca/3100016451.pdf
    • https://uploads.strikinglycdn.com/files/96f68e36-dc71-4fdf-92f3-977ae9a97811/magna_carta_holy_grail_tracklist.pdf
    • http://rasiwarivosifid.epizy.com/cbse_class_12_english_question_paper_2020_solved.pdf
    • https://uploads.strikinglycdn.com/files/131ddc6f-1ed1-496f-a61c-4a2c4dee3d49/how_to_refill_hp_301_ink_cartridges.pdf
    • http://wubexemetaxoru.epizy.com/the_casino_job_full_movie_hd.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f737.bin
cc7c55318a7d9925dec71de5604dcafb7f0e038bdb6462dde62145979cfb5265
pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 6108 bytes
font_01_sfnt_off00010bf2.bin
ee73bd69fb4b2b9ddc3d5b31d47c0b0925d9036aed3a20ca73ad62ad2df52776
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 10888 bytes