Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8b7514e4fd229e…

MALICIOUS

PDF

35.6 KB Created: 2020-03-21 16:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 651f89ec5ac3262aa6775136116eb32a SHA-1: 031622e8fefa829cb8e8fb8f5ec3e3da34d101e2 SHA-256: 7c8b7514e4fd229e35ed6af397ecacf686f8f3569240857ad9ed683534b679a1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm. The ML classifier strongly indicated maliciousness. The document body contains what appears to be product information mixed with application metadata, but the primary malicious activity is the mass distribution of external URLs. These URLs are likely used to distribute further malware or engage in SEO spam.

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://shopbelfast.info/uploads/1/3/0/8/130813783/130813783.html#pierce+10x+western+blot+transfer+buffer+methanol-free
    • http://nuttybeepdx.com/uploads/1/3/0/6/130639231/nozefagepowakedewabi.pdf
    • http://sweetsugatherapy.com/uploads/1/3/0/7/130739446/3032176.pdf
    • http://shadow-kreations.com/uploads/1/3/0/6/130639980/divelogag.pdf
    • http://matttreppel.com/uploads/1/3/1/1/131164021/3c90c.pdf
    • http://mail.brianschoettler.com/uploads/1/3/0/3/130323184/7070861.pdf
    • http://jfmarbleandgranite.com/uploads/1/3/0/7/130739970/juxim-teronidewox-pirozigav-lemizik.pdf
    • http://neaod.com/uploads/1/3/0/6/130639530/5276250.pdf
    • http://creative-district.com/uploads/1/3/0/7/130739631/4586386.pdf
    • http://www.rjconstruction.org/uploads/1/3/0/6/130604951/pegotojiwip-kadesowoki.pdf
    • http://moonrisetours.com/uploads/1/3/0/7/130738543/1719941.pdf
    • http://usvisahelper.com/uploads/1/3/0/2/130271072/3872f3eb76d.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_off00005f80.bin
04553e218a03a2752ab87b348368a22094809b76f7e5b1ea892447432f2acc7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 8320 bytes

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