Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccef020bc5e70e3a…

MALICIOUS

PDF

86.1 KB Created: 2021-04-06 23:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7c083bf1f0855038c2fe00e66743b5fc SHA-1: 24182fab1ee9647e2b712ccc867b2e1535350a93 SHA-256: ccef020bc5e70e3af0304ef7691f75b19a6d242094265be5b2d1bda60a4ed329
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like sqhk.co and weebly.com, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect the user to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://dugedepap.ru/strik?utm_term=who+really+invented+the+telephone+first PDF link annotation
    • https://cdn.sqhk.co/jiwejujorod/jlhf6jd/mini_me_games_production.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/iikiiha/52305655977.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/lerexesadabu.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ijdMphc/72137723969.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/giijhhX/34029615778.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/5zH6Uhi/new_york_times_mini_crossword_june_13.pdfIn PDF document text
    • https://bijupodenu.weebly.com/uploads/1/3/4/8/134894051/zawadurugafoxutez.pdfIn PDF document text
    • https://sisivijujejaliw.weebly.com/uploads/1/3/2/7/132741673/luwowoposovezebivex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/fetusazesowevapo.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ff13b76c8c934927a539986493d9c0cd.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9ac21e5598bb49e8981db1168c9c77e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/corbett_maths_5_a_day_answers_july.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_d8bc18105a394d40b53507dadaa0ea97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f480af8-3b53-4fd9-997a-d046823fce13/what_factors_affect_seawater_density.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c458c977-5632-4793-b53c-4356414fc94b/7_years_old_lyrics_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012cc6fb-6734-42cc-a1d5-2fb01212a677/what_is_my_zodiac_sign_by_date_of_birth_and_time_india.pdfIn PDF document text
    • https://80d0ab3e-5d82-4547-8f02-ffe19150e389.filesusr.com/ugd/776b9b_12ec88828f164e5b93ade2cd7c9d4d7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/nidojabux.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_bd536c71a55742df8a2867cf427a1b51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c04b6b-fabe-48ab-b000-1366e4a4816c/how_to_charge_petsafe_dog_collar.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_dbee99d0557a48aa81fb6baf03f88c3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/58001025360.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_b43a261a1ed143e2bf0a5bad319c23c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/14993391842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46078fb-165e-4e79-84ae-6d4d81451af1/rariguvenavibapowuxoti.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_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 5304 bytes
SHA-256: b15022a163730c8354a3ee85dcc479045f089baff7a60df51bf417a2f04a0501
font_01_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 11616 bytes
SHA-256: 781254160779a5e69153e3bf8f5844ea369ae96f606004f1c4e9e8dbe908ad68

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