Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5efce2132da4c30…

MALICIOUS

PDF

80.4 KB Created: 2021-01-04 18:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b3307fd09b179ab3e13254eefd4647a6 SHA-1: 24fe65e23c94e126c695a94bb07720e3d5aa98bf SHA-256: d5efce2132da4c30f239d2f7a41dc67c998cf1e9fa83311a6ce1c9ff496f463d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged 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. The document body, though heavily obfuscated, appears to reference 'Apc back-ups es 350 owners manual', likely a lure to attract clicks to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=apc+back-+ups+es+350+owners+manual PDF link annotation
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/5378138.pdfIn PDF document text
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/pawitokonum.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/92a3f.pdfIn PDF document text
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/a803198742b.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/5faac55e.pdfIn PDF document text
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/803b78ed4e4.pdfIn PDF document text
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/6563790.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/vusidewaluzom.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/1923983.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/gajukog-selosetukenufi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/fc2c4a62-4b2f-4aa0-ae30-e7e51e6864af/rhizaria_clasificacin_de_investigar.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/96147448909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b589a794-0abf-4a37-8005-90824c9e9eb7/pefesudapevizonazivamu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/9119805442.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 1652 bytes
SHA-256: 8fdc6e8affd972bac092db5fc53afd4c18c9b23cd43bde58d9688b683386549d
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5828 bytes
SHA-256: 58954a1941755ed738a9393c8d56d371667c7eb3bf9bbd9ea333dfa216d6b1f3
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 12264 bytes
SHA-256: da1c5a27710ab4f214cb217a2d5232d935d99d1de2d500bfd5a3be9b3b6229e2

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