Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa56a65ed6db77ed…

MALICIOUS

PDF

38.5 KB Created: 2020-03-19 13:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b946772eb5b684702e91676e58e578a SHA-1: 083c3163c5cb40f094f04de7d795c176ded0cac9 SHA-256: fa56a65ed6db77ed821d68490dbe78cd22743ca1ba1983eab0c178004e491917
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The document body contains a title related to children's stories, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful external 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://jhrpropertyltd.com/uploads/1/3/0/3/130379246/130379246.html#cuentos+infantiles+cortos+para+ni%C3%B1os+de+inicial+con+imagenes
    • http://tacomachamber.com/uploads/1/3/0/6/130639885/3eb59ac4548.pdf
    • http://www.crackellaw.com/uploads/1/3/0/5/130539908/a2871f5ae.pdf
    • http://thedustycockatoo.com/uploads/1/3/0/5/130550858/9954217.pdf
    • http://www.costumiercollection.com/uploads/1/3/0/7/130776263/zexuxebag.pdf
    • http://ryanhuff.org/uploads/1/3/0/2/130289196/jigoginupip_wafuw_pidan_vepun.pdf
    • http://nfynia.com/uploads/1/3/0/7/130775092/dusijubixawo_nilikurotogedub_lirarubakuwe_jabapi.pdf
    • http://mysecurit.com/uploads/1/3/1/0/131070571/1715546.pdf
    • http://northtexasrvresort.com/uploads/1/3/0/9/130968963/e19824.pdf
    • http://morrisboydphotography.com/uploads/1/3/0/7/130739510/4667927.pdf
    • http://leairascustomcreations.com/uploads/1/3/0/7/130775197/bedazum.pdf
    • http://millscountychamber.com/uploads/1/3/0/6/130621119/8a3875b2c21.pdf
    • http://bridgeportfamilypharmacy.com/uploads/1/3/0/8/130813448/3633304.pdf
    • http://capehomerepair.com/uploads/1/3/0/7/130739779/duwezowusevufogema.pdf
    • http://acupuncture4pets.ca/uploads/1/3/0/6/130605164/159f1.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_off00006b8e.bin
c8da7778ce770ae4b2e4f67a1fc868885b9459f4e62429c374b862cc1aac4291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 8140 bytes

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