Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc03c4c4aca92d8b…

MALICIOUS

PDF

68.0 KB Created: 2021-06-14 04:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad482349630db11ed4363898df5389a8 SHA-1: 053fc97dc8e847a25f46a87c44113120e481ca8c SHA-256: dc03c4c4aca92d8bafd27c15e11a601a0f29203c0a4a718623d0206cd0484424
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=crop+bitmap+android+example PDF link annotation
    • https://dibagipowuxuz.weebly.com/uploads/1/3/0/7/130776183/futonadeki.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/satenaves_xivusamur_wumopafux_vafonowuruvaj.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/74b280b54091c.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/renuluk.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/760925.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/2646748.pdfIn PDF document text
    • https://gijogolip.weebly.com/uploads/1/3/4/7/134755622/rekezu.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/mulunabidus-xoluwikut-guvuwunap.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/3797792.pdfIn PDF document text
    • https://kevesotajomuvow.weebly.com/uploads/1/3/5/9/135959451/lomopotiwe.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/a76eebf0b6ab63.pdfIn PDF document text
    • https://jolifovinezaxa.weebly.com/uploads/1/3/7/5/137518016/3f39eeb7b64.pdfIn PDF document text
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/damirodavawe_tosetaxaxafixux_lolite_buwukaz.pdfIn PDF document text
    • https://guwifanifinib.weebly.com/uploads/1/3/2/7/132740319/mowemix_dozozimubejisa_fizojarebipexan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144569217/btools_hack_roblox_free_admin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421f3cc2-60e4-490a-b198-85d40045e1f8/where_to_donate_toys_in_new_jersey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc4b17d-9cab-4e89-b070-55ab2a34a8b6/taxoxusepukuwuxirukixa.pdfIn PDF document text
    • http://daxulesep.pbworks.com/w/file/fetch/145176177/online_jathagam_with_date_of_birth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e11282-504d-4d36-b2a8-2a905c2261ad/keluzijo.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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 5040 bytes
SHA-256: e9b23885c67f8d06e228001c461ae8639960c40bcc9a0b2b73a4c16f041259b5
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10364 bytes
SHA-256: 36882fc3d4799bdd5c6fcdae6213a8a89ef61fc2d382529005e5a5951e9d5d0e

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