Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf8edb23aa6a3c8…

MALICIOUS

PDF

90.3 KB Created: 2021-03-22 03:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 58685babbbc42f40e9388c7bdc50fd66 SHA-1: 21cfbc7239bf68f9cc510752cbadb0b5d5aae71f SHA-256: acf8edb23aa6a3c89d7b175ec6d47c0e3ac61e0cb1c3ad8ee08ed56274b2e6c2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links points to an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=tera+brawler+pvp+guide+2019 PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/iTgeg25/31484005344.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gjjcjf0/14570539134.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/9027435.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/7012f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_604ad31043c43.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/fec66d772.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/U3VggDQ/word_quote_crossword_puzzle_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fe8969a7b107.pdfIn PDF document text
    • http://getizibibi.22web.org/kodiak_weather_report.pdfIn PDF document text
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/fezuk.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/Higijig/73075533047.pdfIn PDF document text
    • http://gidilixad.66ghz.com/wikubobolalakepejimaf.pdfIn PDF document text
    • http://towibukawit.22web.org/how_to_fix_an_off_balance_washer_drum.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/xamibebulosaxug/mechanism_of_fever.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/29525941870.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/gowenuke.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_58406ce81ad64b4b875c2a4419d959b9.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_1248d91ed5bc49c5a1b28f23c72ef94d.pdf?index=trueIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_7aa8e3187d7249ef874118feb007d085.pdf?index=trueIn PDF document text
    • http://batalogafoma.epizy.com/tesumutalidofujujaxivapo.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/english_conversation_15_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/73833525618.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_bc83392b3da3432987aba1f33b7af294.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/23689258449.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_fa390783390e45d29a174a8d673cb7cd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 5672 bytes
SHA-256: a04ed7d13fb1d4ac0ec6bdeff1822a4cb614dd8decb55eb5a30041c068adb9f8
font_01_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 11016 bytes
SHA-256: 515bf01d8502128de37c5612ea90372098662999f79271176f9a0381e5c83a37