Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d74b0bb3a910be6…

MALICIOUS

PDF

46.8 KB Created: 2020-04-09 06:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48d3ad221ac67559df03c90450627379 SHA-1: 11a30f776fb95f29d6c4b809dba6f5afba6955c8 SHA-256: 7d74b0bb3a910be64d9a8562ce935891c9976ecc3f19d452aa69327159615466
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable, but the presence of numerous external URLs suggests a malicious intent to redirect users to potentially harmful content or phishing sites.

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://forrightnow.com/uploads/1/3/0/5/130543065/130543065.html#formulacion+del+problema+de+investigacion+concepto
    • http://mishareads.com/uploads/1/3/0/5/130551089/niwabezasufapotenojo.pdf
    • http://alexmoskowitz.com/uploads/1/3/0/2/130274281/gezufejizelitofu.pdf
    • http://therawsisterhood.com/uploads/1/3/0/9/130969310/bovopodusorefivokopo.pdf
    • http://emotiontheatrefilm.org/uploads/1/3/0/5/130540437/zutaxaxozum-zewaloseko-tufukutotu-pubaxu.pdf
    • http://brightstaradopt.com/uploads/1/3/0/5/130589313/7d5d15938c2e5.pdf
    • http://sustainablesiam.com/uploads/1/3/0/5/130541765/9621876.pdf
    • http://mobilemechanicbasildon.com/uploads/1/3/0/5/130551338/dimuketasifizomepe.pdf
    • http://stlukebc.net/uploads/1/3/0/7/130740074/a8fd3298ea131a4.pdf
    • http://smalltransformations.net/uploads/1/3/0/3/130313000/majuneneko.pdf
    • http://bangkokpalaceportland.com/uploads/1/3/0/8/130814197/bavebu-jizowonenig.pdf
    • http://272097760920155322.com/uploads/1/3/0/6/130639635/1747204.pdf
    • http://elfredo.com/uploads/1/3/0/5/130552106/0d66752fc5d9e.pdf
    • http://normantest.com/uploads/1/3/0/6/130604637/gejofifidazilodiko.pdf
    • http://friendlyschoolcounselor.com/uploads/1/3/1/4/131406807/xurix-ninafegivexuv-vepidetabuf-wojipagomure.pdf
    • http://nakedcakes.studio/uploads/1/3/0/8/130813118/920721.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_off00008caa.bin
c4c25fb3f0d23723ff8456b226b049021019a7e1ffbeb3e7313ca4b6fb3fcf17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAA 9196 bytes

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