Malicious PDF — malware analysis report

Static analysis result for SHA-256 169195e78bb1ef0d…

MALICIOUS

PDF

38.5 KB Created: 2020-03-24 19:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8ccd1f72f692d7daa71f8c604e4fb3f2 SHA-1: 3cd651d17ed3d05adc5e0f9aaedecfcdb2f412ad SHA-256: 169195e78bb1ef0d8c28a8ea92ee231bed91f97e29b2bc61f2b30d3734696095
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links pointing to external websites, a technique often used for SEO manipulation or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://yolozwolle-lekkerpuh.nl/uploads/1/3/0/4/130483690/130483690.html#cuales+son+procesos+cognitivos+basicos
    • http://joegaul.com/uploads/1/3/0/9/130968942/tadapiwulivat-perisulobu-nafexonetokegov.pdf
    • http://rtcases.com/uploads/1/3/0/3/130379504/ravodunanu.pdf
    • http://eabhyaas.in/uploads/1/3/0/4/130476853/zunefiduxixijasomon.pdf
    • http://lisadring.com/uploads/1/3/0/8/130813557/5936543.pdf
    • http://www.whatsyoureroticblueprint.com/uploads/1/3/0/2/130287317/zuvamopivipo_pulogite_zojirugaze_sizuzode.pdf
    • http://d-phoenix.net/uploads/1/3/0/5/130590310/6352595.pdf
    • http://minimalmac.net/uploads/1/3/0/4/130488244/kujunafave.pdf
    • http://hintonartclub.ca/uploads/1/3/0/6/130604562/002a42cbd.pdf
    • http://topgunnhomeinspections.com/uploads/1/3/0/2/130273872/4db3e05.pdf
    • http://mysweetsister.net/uploads/1/3/0/4/130483147/c38eb7.pdf
    • http://popupsj.com/uploads/1/3/0/6/130604088/muvirawoxulidufumeb.pdf
    • http://maria-donata.com/uploads/1/3/0/8/130874136/tukerer.pdf
    • http://garagedoor-repair-renton-wa.com/uploads/1/3/0/8/130874115/921164.pdf
    • http://hothousebruiser.com/uploads/1/3/0/4/130435679/pubomipuri.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_off00006c57.bin
598961120f3d483667d8483b56c78ad0c6b425e8d4749503a55d4546662427f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 8880 bytes

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