Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a26f80d8947af1d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 20:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 75acb0c3510758a60370f50b7ea5de32 SHA-1: dfb55b8f88502fa9146744398de1a4eb385ba368 SHA-256: 0a26f80d8947af1d129a4fbd3023e7b7bc92ac8092ba3977f81968e2bd4be89d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/123?utm_term=resident+evil+4+apk%252B+data+zip PDF link annotation
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/nidavazewun-karoj-pujewomis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_603cacb34dffd.pdfIn PDF document text
    • http://sununetapa.22web.org/greenhouse_seeds_bubba_kush_grow_report.pdfIn PDF document text
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/romixiguvap.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://itsnat.space/action_movies_2017_english9ba2z.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/lewotarotupip-zajarevasame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fd712d5a7a98.pdfIn PDF document text
    • http://on-arenas.com/fitbit_charge_hr_turn_on_bluetoothri3cj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_603f5a0e92241.pdfIn PDF document text
    • http://twobigs.space/calories_in_dunkin_cold_brew_with_almond_milke6dgy.pdfIn PDF document text
    • http://legejuwarowu.22web.org/bufogekulofefoganedimit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6026a6804ef22.pdfIn PDF document text
    • http://trokot-online.xyz/xajofigisodopuserebijuziurdjj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://begosene.epizy.com/nibezomaj.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_89edb7d17ed94396bd0f6c20d84e4d21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulazelof/motu_patlu_cartoon_full_movie_3gp.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_4f824d6887434723a79088b4aef7db4c.pdf?index=trueIn PDF document text
    • http://bavosezema.epizy.com/gisomazifutal.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_c7b40484039c4cc8990245159131ea34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/50_shades_of_gray_like_movies_on_netflix.pdfIn PDF document text
    • http://sonopuzogex.rf.gd/gujomijivenunibako.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_c6f5f055c51149adaaa50c95ffe1cb2c.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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 5124 bytes
SHA-256: a2da7b1e36cf459faff19f923b88caf6124938913eaa21dd5a31ce194bdc0fcb
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10688 bytes
SHA-256: 95e08eff385286deaf047b86f503f7c85ae1bc1e12077b11afccf2870fff74c0