Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afe3aad3c2baba1…

MALICIOUS

PDF

94.2 KB Created: 2021-04-10 07:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88bea3962caa88846cf0487565d74fe3 SHA-1: e1bcf15f9a94aa8ae1c05b87ce76dd75654d4535 SHA-256: 3afe3aad3c2baba1b51b03b6ebaf470d22bd98455a73276a90a5ea3dabbd34bd
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous embedded URLs, with a primary focus on directing users to `https://dafemum.ru/strik?utm_term=list+of+v1+v2+v3+v4+verb+forms`. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=list+of+v1+v2+v3+v4+verb+forms
    • http://jetavimazi.22web.org/fight_song_piano_sheet_music_free.pdf
    • http://nuwojukow.mygamesonline.org/nitro_pro_7_to_word_converter_free_download.pdf
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/2277973.pdf
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/vuwap.pdf
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/eb9a05cd3d7.pdf
    • http://homiak.fun/physics_formula_sheet_grade_11n2uut.pdf
    • http://fawikenaxalu.scienceontheweb.net/i_raise_a_hallelujah_lyrics.pdf
    • http://cucoupon.info/casio_lk-100_keyboard_for_salexyntm.pdf
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/zufun.pdf
    • http://nedavupagisezim.mygamesonline.org/fofebegizadexudor.pdf
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/6efab3bd375.pdf
    • http://zirosax.iblogger.org/how_reliable_is_relion_prime.pdf
    • http://xunetokawetik.sportsontheweb.net/blindfold_chess_book.pdf
    • http://porn77.design/what_are_the_effects_of_covid_19_in_nigeriaphacn.pdf
    • http://xovitixekewelom.scienceontheweb.net/ideology_and_ideological_state_apparatuses_essay.pdf
    • http://circleshtang.xyz/bumbles_pet_guideqe1pq.pdf
    • http://fruitnaturs.space/navien_tankless_water_heater_comparisong896n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotenukevepunin/xamupalivefuri.pdf
    • http://torogadebiwi.rf.gd/chevening_networking_essay_sample.pdf
    • https://s3.amazonaws.com/dinilederu/flower_vector_images_free.pdf
    • https://s3.amazonaws.com/lezerawe/nadakekukufupubetigudam.pdf
    • http://mezifaxura.rf.gd/ccleaner_professional_plus_full_crack.pdf
    • http://fosekor.epizy.com/9th_grade_math_word_problems_worksheets.pdf
    • https://s3.amazonaws.com/xepululejiwof/33004451662.pdf
    • https://s3.amazonaws.com/tosego/1101042060.pdf
    • http://kosezofejesuxef.atwebpages.com/rabbit_anatomy_download.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_off0001338b.bin
98d123a342a89ede1b9b76bf905b01ff6daa28a56ed3604a6a942d0a722f555b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 5248 bytes
font_01_sfnt_off0001456f.bin
c83724e2e8681dc002a359bdc417129474e92fbe8281ea6db4db3b3853c081d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456F 11424 bytes