Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfb1936a0b38042…

MALICIOUS

PDF

37.7 KB Created: 2020-03-30 07:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 68c82e3c3b35b192fd0ccc26e309edf2 SHA-1: 6f19e747718d0a5167da2fa0782df2d667dba716 SHA-256: 0bfb1936a0b3804264eb48fe12995407f4e8c872079cb54ab2eecc56d9cc09f4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the PDF structure exhibits characteristics of a link farm. No scripts were extracted, but the sheer volume of external URLs points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://74-123-77-70.mgwnet.com/uploads/1/3/0/5/130589316/130589316.html#my+catholic+faith+catechism+contents
    • http://shawtoliver.com/uploads/1/3/0/7/130775756/e373307c67.pdf
    • http://kyatwobirmans.com/uploads/1/3/0/4/130476970/987e07eac97b15e.pdf
    • http://qpp.se/uploads/1/3/0/5/130544090/690993490a4f850.pdf
    • http://kidscreativestudio.com/uploads/1/3/0/6/130639553/d2489.pdf
    • http://smetaxadvisory.com/uploads/1/3/0/5/130589189/xapasofelozelim_soliwelakesebub_koluluv_jifiwijidija.pdf
    • http://www.evitajesthetics.com/uploads/1/3/0/4/130436181/pevanedutolile_bekekuxepolu_nikelofulafilij_tenurowezi.pdf
    • http://preparingforaction.org/uploads/1/3/0/4/130476034/8935587.pdf
    • http://bestbridalsalonsinboston.com/uploads/1/3/0/4/130435685/66def484d5.pdf
    • http://mindexpansionacademy.com/uploads/1/3/1/3/131380589/gutamenud.pdf
    • http://avnsolutions.com/uploads/1/3/0/8/130873732/zixelizevirinu.pdf
    • http://kysciencecouncil.com/uploads/1/3/1/1/131164159/1487014.pdf
    • http://store-today.com/uploads/1/3/0/8/130874050/4069050.pdf
    • http://kikoloves.com/uploads/1/3/0/6/130639972/nimakur_duxigonolulurid_raluv.pdf
    • http://techneviah.com/uploads/1/3/0/4/130483781/71606f464cc.pdf
    • http://latitudeprivateacademy.com/uploads/1/3/0/7/130740092/vimisafu.pdf
    • http://firstgraderams.com/uploads/1/3/0/3/130312916/sipodurulefo.pdf
    • http://gracefullyglitteredcreations.com/uploads/1/3/0/6/130604240/85a0f0ae31bf4d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006821.bin
491377623abf2713dfd6b0afc983f8fb4d5cb21c1d6a04c53ff238ff0b537d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6821 8276 bytes

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