Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1c0b2d2b5606e1…

MALICIOUS

PDF

38.5 KB Created: 2020-03-16 10:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f95a2eead03d5bc874ed8e24f29d7302 SHA-1: 8db817099c4a97b9abdeac86b74ece16efbbe8d4 SHA-256: 9b1c0b2d2b5606e1f283e4554b5e8ebd8944af6feaa93b1aa8a32c1887c5a848
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to PDF files on various domains, which is indicative of a link farm or SEO poisoning attack. The ML classifier strongly supports maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be directing users to a network of potentially malicious or spam-related websites.

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://richter-family.rominastiebenphotography.com/uploads/1/3/0/7/130776599/130776599.html#types+of+sentences+exercises+with+answers
    • http://zenobunny.com/uploads/1/3/0/4/130489044/pajipub_dusoradabuvape.pdf
    • http://pirumanors.com/uploads/1/3/0/8/130874079/e81e69.pdf
    • http://calebnoska.com/uploads/1/3/0/6/130620934/kizuvuresadusaxejexo.pdf
    • http://www.puffsandstuffs.com/uploads/1/3/0/6/130605076/kipojadun-legagoxuvesir-limavipunegipa.pdf
    • http://lossantosfrontlinerp.com/uploads/1/3/0/3/130323488/2fae591.pdf
    • http://bellasafety.com/uploads/1/3/0/5/130543107/ruwuxapup_zututi_tafuza.pdf
    • http://poulsborvmtvernon.com/uploads/1/3/0/7/130739559/e3898407ac2bc.pdf
    • http://londonbroadcastingcompany.com/uploads/1/3/0/8/130874598/ronomibuwuw.pdf
    • http://erniebauer.com/uploads/1/3/0/5/130546343/f7837714e1e6f9.pdf
    • http://elizabethtleern.com/uploads/1/3/0/6/130605502/ba2c51122d07d.pdf
    • http://musicalmonday.org/uploads/1/3/0/6/130605162/matobumizado.pdf
    • http://yardsalessource.com/uploads/1/3/0/5/130588710/medusujibab_telojivin_julebati.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_off00006eb1.bin
ec4e1c65e37dec8ec3c6fc14b93b75c828fa2e94dee0c83941370abf1d1cfaf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB1 7844 bytes

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