Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed83f3374fa22a5…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 12:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e48387cabbea62b9afa059f24b7330b SHA-1: 482fecb075d1a0e75572184ac6718312a9106de7 SHA-256: 0ed83f3374fa22a56c5c30148ed4f926b11d54040fabbff0e36b50ae3bf457fc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/123?utm_term=agrimotor+sx-+15d+manual
    • http://dupipavigojas.iblogger.org/william_wilson_personajes.pdf
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/5509814.pdf
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/5956632.pdf
    • http://favowavuwoxi.iblogger.org/how_to_use_resistance_bands_for_knees.pdf
    • https://napumijuvof.weebly.com/uploads/1/3/4/7/134758185/sisivafavojeziz.pdf
    • http://femalawiterig.iblogger.org/report_on_teachers_day_celebration_in_marathi.pdf
    • https://xonunate.weebly.com/uploads/1/3/4/4/134478107/monegen-lanekixosex-duzeb.pdf
    • http://leledup.mypressonline.com/binomial_expansion_exercises.pdf
    • http://nipizakevenuvis.scienceontheweb.net/fiche_de_lecture_la_boite_a_merveille.pdf
    • http://luvetikemo.66ghz.com/bodyweight_squats_proper_form.pdf
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/lakobakobadurajamos.pdf
    • https://neriguzoxivefu.weebly.com/uploads/1/3/5/3/135319498/niwolokufusoson-puvotuwijuko.pdf
    • https://biripujoj.weebly.com/uploads/1/3/5/3/135338152/kevolumaro_bijudulajo.pdf
    • http://ridikomalav.22web.org/43958501446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lununobasafino.rf.gd/pokemon_platinum_walkthrough_download.pdf
    • http://wilunimexa.epizy.com/physics_worksheet_electric_circuits_answer_key.pdf
    • http://roxixelojoxas.rf.gd/tutorial_java_swing_netbeans.pdf
    • http://nuwudepebepusab.rf.gd/rarulibime.pdf
    • http://tibilekozox.epizy.com/24502021091.pdf
    • http://rapuzezu.epizy.com/bartter_syndrome_treatment.pdf
    • http://vavilomakuv.epizy.com/probability_and_stochastic_processes_homework_solutions.pdf
    • http://zanatibagewo.rf.gd/aramaic_bible_in_english.pdf
    • http://zejimuporuje.epizy.com/what_started_the_potato_famine_in_ireland.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cceb.bin
7108156ac245bbd3346ed4324e7706dc1ca42f47fb82c6fda65c2067edfa9230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 5172 bytes
font_01_sfnt_off0000de72.bin
4b5843ecfd41064848267a26c45a0b610003f3fc9225a4536ea5c6c4c17aa49a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 12240 bytes
font_02_sfnt_off00010506.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 4324 bytes

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