Malicious PDF — malware analysis report

Static analysis result for SHA-256 f503fcb87b264fa9…

MALICIOUS

PDF

40.3 KB Created: 2020-03-24 20:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d67c5e5ecfdf9433e6cfa12a6aca99de SHA-1: 2e19da78a5737e6b088d47574c56cc5294c1dc1c SHA-256: f503fcb87b264fa995e578fff177408cf6e898b58bf48b67d214d4da1ad710f8
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to unrelated domains. This behavior is characteristic of a link farm or redirection scheme designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended to lead users to harmful 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://craniosacralnashville.com/uploads/1/3/0/6/130605167/130605167.html#importancia+de+la+comunicacion+en+las+relaciones+de+pareja
    • http://mindcoachnederland.nl/uploads/1/3/0/7/130776702/6695438.pdf
    • http://bellmansionbedandbreakfast.com/uploads/1/3/0/6/130620563/dejubu.pdf
    • http://ctruin.com/uploads/1/3/0/6/130621290/776e23f3d45729.pdf
    • http://bbodaciousfitness.com/uploads/1/3/0/2/130272339/munuvorixowegenozame.pdf
    • http://premodsystems.com/uploads/1/3/0/6/130604688/wonib.pdf
    • http://shelikesroses.com/uploads/1/3/0/6/130605349/8294494.pdf
    • http://triangleythorsemanship.net/uploads/1/3/0/6/130604249/gowem.pdf
    • http://reducedfeemortgage.net/uploads/1/3/0/4/130477351/tazux-romitime.pdf
    • http://amberhis.com/uploads/1/3/0/6/130620751/cd2bbc10.pdf
    • http://thewarwickgroupglobal.com/uploads/1/3/0/4/130483354/4198973.pdf
    • http://mta-sts.mx.mountainrestorations.com/uploads/1/3/0/6/130639541/mufum.pdf
    • http://puzzlescleaning.com/uploads/1/3/0/4/130477039/914372ec.pdf
    • http://melburgdesign.com/uploads/1/3/0/6/130604226/de69224.pdf
    • http://alexislaurenware.com/uploads/1/3/0/5/130590435/ebcd29a4.pdf
    • http://www.jennwatson.com/uploads/1/3/0/6/130639172/buxazujovukefaw.pdf
    • http://norshus.com/uploads/1/3/0/6/130603966/e5ee2050e25d.pdf
    • http://customerfocusedlearning.com/uploads/1/3/0/6/130604201/karevobufukokaxazeko.pdf
    • http://mrsjewelrydesign.com/uploads/1/3/0/6/130621734/xuvupe.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_off000071f3.bin
dc30cdd065702a3d93b7f7eed38c6d7318814e0aa59d936c91998623ddfa620f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F3 8720 bytes

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