Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c8e746ef4db2f0…

MALICIOUS

PDF

33.4 KB Created: 2020-04-19 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb4e75474354ebec81fd40f313d0fb51 SHA-1: 4b4000f2a448d7bd5de51786b8d6534dc68a6b6b SHA-256: 34c8e746ef4db2f0aa94dc831d8fa07b8465f4cc3d5a6e7f2ca876c4bb3b68a9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various PDF files hosted on different domains, a technique commonly used for SEO poisoning or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern involves directing users to a network of websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jennybevis.com/uploads/1/3/0/4/130476288/130476288.html#angrej+amrinder+gill+punjabi+movie
    • http://sugarfischyteam.com/uploads/1/3/1/6/131606035/5822934.pdf
    • http://precisionmobilellc.com/uploads/1/3/0/6/130604310/dagowelopiwof.pdf
    • http://mannbrotherssolutions.com/uploads/1/3/0/5/130550681/sigoj_nobipisubere.pdf
    • http://soumissionassurancecharlevoix.com/uploads/1/3/1/3/131384567/728403.pdf
    • http://desoto-carpet-cleaning.com/uploads/1/3/0/2/130289652/pawalabudol.pdf
    • http://cigarlife365.shop/uploads/1/3/0/6/130621462/jozedarobixo.pdf
    • http://starrstruckblog.com/uploads/1/3/0/6/130604918/jaxagijusuvudo-letiru-kemamamaruru.pdf
    • http://savetheearthnow.net/uploads/1/3/0/2/130270823/98b4187cc9.pdf
    • http://thescriptorium.org/uploads/1/3/1/4/131452963/e54439098.pdf
    • http://axminster-ringcraft.com/uploads/1/3/0/8/130814591/0a443255e626.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c7c.bin
73f3fae316a614d2e41b91986025e93f64a34f2127673b667ac65b29bd744e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7C 7072 bytes
font_01_sfnt_off0000688b.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688B 16036 bytes

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