Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c2fb04db77bce5…

MALICIOUS

PDF

38.4 KB Created: 2020-03-11 14:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dac18a6cc169100739029526afbad0f1 SHA-1: e8b01c86b6e6f41d73b21a2d2f394dec9e2ef784 SHA-256: f7c2fb04db77bce54ae67106cd52d67b8d92f14071ffe2fccae0e0d0edc03336
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to adding a PDF printer and references to wkhtmltopdf, suggesting it might be a generated document. The primary function appears to be directing users to numerous external PDF files hosted on various domains, likely for SEO spam or to distribute further malicious content.

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://bridgestreampublishing.com/uploads/1/3/0/4/130483697/130483697.html#how+to+add+adobe+pdf+printer+to+mac
    • http://oasislifestylesandevents.net/uploads/1/3/0/6/130621946/16c422.pdf
    • http://texas2stepfilm.com/uploads/1/3/0/6/130639442/fodonivaziwisoz.pdf
    • http://www.trailbrake.net/uploads/1/3/0/7/130739113/sogitewuboroxajili.pdf
    • http://trustedbusinessadvisoracademy.com/uploads/1/3/0/5/130588201/a9d12d9071b09c.pdf
    • http://gongmamma.com/uploads/1/3/0/4/130483508/pululu.pdf
    • http://www.greenzonefx.com/uploads/1/3/0/6/130639513/40db1918.pdf
    • http://nhtmedia.net/uploads/1/3/0/3/130379072/mejupogogoxumax.pdf
    • http://revirg.com/uploads/1/3/0/5/130588501/1589489.pdf
    • http://www.j-acoustic.com/uploads/1/3/0/6/130639152/16f7794dfc2.pdf
    • http://keblemusic.co.uk/uploads/1/3/0/6/130639642/lezijuledi.pdf
    • http://skills4nz.com/uploads/1/3/0/3/130323424/353f9208bce.pdf
    • http://sleepyhollowplumbing.com/uploads/1/3/0/7/130776677/tufapuwulik_debevixisab.pdf
    • http://www.brandslamm.com.au/uploads/1/3/0/6/130603932/jipafelimopuwojaribo.pdf
    • http://dallasclinicalpsychology.com/uploads/1/3/0/5/130550967/rapokigefumusix.pdf
    • http://lawrencehargravecentre.shirehistory.org/uploads/1/3/0/6/130605516/8672468.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_off00006cff.bin
dbec4c1277741663e5fac5191a6da55229bbe83be2a1345fcbc2018b55f90656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFF 7592 bytes

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