Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d29cd08675c440…

MALICIOUS

PDF

34.7 KB Created: 2020-10-02 13:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ceb99f0463741ad890203d6b2923caea SHA-1: 81397e1665b157838c5b78eb9d7335b9f9c6a0ce SHA-256: 63d29cd08675c44099fd73c383f79b8ea1917009dacc851f07faac141c114182
224 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known redirectors, indicating a link farm designed for phishing or malware distribution. The document body, though partially corrupted, contains a reference to 'Dectron service manual' and a malicious URL, suggesting a lure to entice users to click on the malicious links. The presence of multiple PDF links and a redirector link strongly suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=dectron+service+manual In PDF document text
    • https://site-1040574.mozfiles.com/files/1040574/lovoje.pdfIn PDF document text
    • http://simezoten.vislitsandbox.com/uploads/1/3/1/3/131384240/ce44d7f031707.pdfIn PDF document text
    • http://files.cfuwhh.ca/uploads/1/3/1/0/131070506/lotefodog-pebonijuro.pdfIn PDF document text
    • http://files.freedomheroesusahealingsanctuary.com/uploads/1/3/1/0/131070581/jonoxegepasad-gujagutud-nutetabu.pdfIn PDF document text
    • http://bowudedi.moonandbackministries.com/uploads/1/3/0/8/130813509/kufebovaw.pdfIn PDF document text
    • http://tunuragu.apextravelogue.com/uploads/1/3/2/8/132814956/0f32dbbbc.pdfIn PDF document text
    • http://files.smihome.com/uploads/1/3/0/7/130738622/614ca5d3f56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/955d8802-2694-43f5-afc6-1b8402d63156/73451428855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9377389-a538-4fd5-997e-6790c1519594/23895887315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27f35ae-3003-435e-90f9-43779789e3b6/tunepor.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_off00004948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4948 5004 bytes
SHA-256: 628eb57213ffe8ceff4e280e472a5ea38268e5e15e62ac669893fd465b78cdfd
font_01_sfnt_off00005a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3F 10712 bytes
SHA-256: fd5461bf4ae5d7b17f78bcdc70c1ce76d0c319689f814b9590a8b64b9ce336cc

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