Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39ebdfde171139…

MALICIOUS

PDF

90.4 KB Created: 2021-06-09 08:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ed18fe92e4008b9d916003fc9e19e545 SHA-1: c3b9125d651e31fa783ede85886543df7402b951 SHA-256: da39ebdfde171139c80ba0fd42cf647c2f15d03fe004bc68a90836648ed84489
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://dugedepap.ru/123?utm_term=pseudomonas+stutzeri+spore+forming PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fec58d90d769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6013ab901877d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_60579aa467eac.pdfIn PDF document text
    • https://xutorobufazam.weebly.com/uploads/1/3/5/3/135345650/tezarikiwu.pdfIn PDF document text
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/wikolepamo.pdfIn PDF document text
    • https://kusagurapatavo.weebly.com/uploads/1/3/1/8/131871515/sovura.pdfIn PDF document text
    • https://rarikomedos.weebly.com/uploads/1/3/4/6/134616559/gipusamonupojas-ruriwurufifav-tarilarobuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_6048abe562b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6038c440bc0d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144727410/lewivexigafanoxar.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/art_of_problem_solving_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8db712c-dccf-4784-8f60-449b1423d7c7/zulixusukefise.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/windows_10_product_key_free_download_for_32_bit.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/xosukorezofeketak.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/83172636599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7527fb2-3ac5-49b3-bd23-f8f0dccd7ad7/wuvevuduxidub.pdfIn PDF document text
    • http://wafijovodek.pbworks.com/w/file/fetch/144927522/the_lovers_guide_1991_online.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144928743/fasipumodalilula.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/f/how_to_get_only_filename_in_command_prompt.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/new_serial_bangla.pdfIn PDF document text
    • http://dokajawema.pbworks.com/w/file/fetch/144757068/peratekoganerobota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db80c79-ee0c-454a-8a44-9a88a0903afb/the_expanse_season_5_episode_7_reddit.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/w/file/fetch/144927276/rhymes_video_free_download_mp4.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144606861/xakatozetobabiwuviso.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_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 5380 bytes
SHA-256: 2f522fc73e45f183b3d54dd92f1043075ac446c9ff3b6c7d4874b8dc4ec84cbf
font_01_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 12192 bytes
SHA-256: 14dc8a30a85d3d99438648e6037c5f972ffc2f93e963b4631e86afbc188783cb