Malicious PDF — malware analysis report

Static analysis result for SHA-256 613b770c8904b408…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 03:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 288442df957850cf68c16391d26aa970 SHA-1: 21867f5fd9fa3e711e93d5f60d253462a6e61b04 SHA-256: 613b770c8904b4081e280131bd8433aabc100c910ea24b462f475b007a42b2f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

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://xajibur.ru/wix?keyword=conceptual+physics+11th+edition+answer+key PDF link annotation
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/gufewu-wawapa.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/danin-walijaraf-dikavop.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/jevufazebu-gasopizaninavu-suvuzexazirero-zumapijeb.pdfIn PDF document text
    • https://gagivoxiw.weebly.com/uploads/1/3/5/9/135991060/5a131aea2d60b.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/fb4c2b.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/analytical_essay_writing.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/vjdhhhh/8164744918.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/sojuw.pdfIn PDF document text
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/9377878.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/2249962.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/24b95494.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/37lp9ic/hard_word_search_games_online_free.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/6645486.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/3dc8edefb24.pdfIn PDF document text
    • https://lolujimibo.weebly.com/uploads/1/3/0/7/130740441/56859ebbc18f52b.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/edv5Dhi/best_creepy_movies_on_netflix_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/RdijhbK/7484862991.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/0ba11f86.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/janirexobijida.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/dotube.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/a726d84cb.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/3711494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telusomabufa.onlinewebshop.net/will_ahsoka_tano_be_in_episode_9.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_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 5376 bytes
SHA-256: 27387a4d54076377bb9097f69809721ac2323848a4d3be951770f8486ab5865b
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 11144 bytes
SHA-256: c52187319cd467480d0c75ccad445f5c9859c0fd1e6d0b39d155eda3c10d99db