Malicious PDF — malware analysis report

Static analysis result for SHA-256 799565457381e469…

MALICIOUS

PDF

77.7 KB Created: 2021-02-14 16:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70dcde871d427525e33e993ac6c9d701 SHA-1: 80ba1e4c4b36823d6f79c7d99105c162fea36975 SHA-256: 799565457381e46972b2bb3b979fdf403b644dac561156ea4a4a332f8daf9767
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary purpose of directing users to potentially malicious or SEO-manipulative websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=wind+energy+crossword+answers PDF link annotation
    • https://namutaborizelo.weebly.com/uploads/1/3/4/7/134766338/teluxuzovuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/8Chiwxt/fapusujutibajonakifiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426812/normal_5ff27fe06961c.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/fghNPha/5666851592.pdfIn PDF document text
    • http://mazanatur.space/collage_maker_free_online_no_registrationt9b8j.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/yI3rhiS/60407128290.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/mdgdgdV/resident_evil_3_movie_imdb.pdfIn PDF document text
    • http://bandalet.club/acrostic_poem_template_free_printablezckzi.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/dmhjihh/daily_health_food_tips_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/whdRb1H/affirmed_home_care_glassdoor.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/78581c5.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/jhifWhh/6653436372.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/J7vibB3/islam_nagar_bhopal_map.pdfIn PDF document text
    • http://meetporte.xyz/jilujiiodt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_60117962ab050.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/popezarabesobukizoji.pdfIn PDF document text
    • http://bbflowers.net/gepujeloserikojekeccly7.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/hfghgd8/pinball_wizard_lyrics_and_chords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601456e35bade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorowubibe.epizy.com/46334861844.pdfIn PDF document text
    • http://rukudukewa.epizy.com/bridge_hand_generator_free.pdfIn PDF document text
    • http://juvadapirepaf.epizy.com/brother_printer_hl-_1110.pdfIn PDF document text
    • http://darelarara.epizy.com/honorably_discharged_army_uniform.pdfIn PDF document text
    • http://gaxapokone.epizy.com/vowabozon.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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5284 bytes
SHA-256: a56210950efe9e2e7266c502bf4e93e88f3299ce45b0f18f46d99c5d2f08c7b1
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 10240 bytes
SHA-256: af692f8faf05125c5ac6af263f33fd0683cfc2fdb355c2dc6507ea93da593217