Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8882c33ae3b22b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 20:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f707a48fc20377219fe418d5b44bde1a SHA-1: c5fe289ecf9483c408866e17e3fc65a7e1f7e859 SHA-256: 4c8882c33ae3b22b4ef4854866b30c56e181cf3d10fe57980af48c4bdd447323
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://ponafet.ru/award?keyword=rotary+engine+parts+pdf PDF link annotation
    • http://vejofewi.iblogger.org/20263018867.pdfIn PDF document text
    • http://hotita.fun/sisters_apparel_teddy_fresh8sl0b.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/zisiwanoletijijenap.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/a2085f.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/a3c466fa3a6cf.pdfIn PDF document text
    • http://podcard2020.site/vatukijonarivaxuwugafa8fln0.pdfIn PDF document text
    • http://pubggaming.online/zojexubuxinafitadogemus2zfgj.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/mujituwikufuvisi.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/3757919.pdfIn PDF document text
    • http://kersita.space/674328072453oeg0.pdfIn PDF document text
    • http://axecheat9.xyz/vocabulary_words_with_meaning_in_tamil7okkz.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/xesumud.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/ibm_maximo_asset_management.pdfIn PDF document text
    • https://koxufujemugipad.weebly.com/uploads/1/3/0/7/130739729/mexefeperutuxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mirovexul.rf.gd/39321957999.pdfIn PDF document text
    • http://diwedowa.rf.gd/divunalitujabose.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/17427160114.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_ac9687ed64d242438e59776c0dfcc7fd.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_664c543837d145f8beea4a6018c2a8ae.pdf?index=trueIn PDF document text
    • http://likijanima.epizy.com/25924579748.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_d83337be1a464189a823811a0036c625.pdf?index=trueIn PDF document text
    • http://tuzotulerijenej.rf.gd/how_to_turn_on_greenworks_pressure_washer.pdfIn PDF document text
    • http://liwajefafujud.rf.gd/calibres_de_conductores_electricos.pdfIn PDF document text
    • http://sulalanetoki.epizy.com/85146864202.pdfIn PDF document text
    • http://pomezisil.epizy.com/64268039274.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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 5288 bytes
SHA-256: 12b99c77810b99ae39c39c8665d2502912508183530aeb2048272832a1488ea8
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10204 bytes
SHA-256: 8bbb57f1279d53cb113d405c2f3d5a78a48b36c8eb96d651c11305ece360dbff