Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9909c0d0f9744cb…

MALICIOUS

PDF

65.9 KB Created: 2020-11-19 06:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca282b8366ce542715395de37a5893a SHA-1: 77f5fe133e6447e91689e82bdf08e0ec8d6d92cd SHA-256: a9909c0d0f9744cbd63d38f9711026eed9f35f4a82f2a90c62437a301dec433c
156 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 pointing to Weebly and AWS hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. The primary IOCs are the external URLs used in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafffi.ru/aws?utm_term=ms+word+free+templates+brochure
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/2294972.pdf
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/e6872449eb3.pdf
    • https://batibama.weebly.com/uploads/1/3/4/3/134338422/folamisesizepofe.pdf
    • https://mudigaxufiwibu.weebly.com/uploads/1/3/4/6/134639529/konap_wukase.pdf
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/3c39a.pdf
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/4109126.pdf
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5f9a20771345f.pdf
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/wabositunogexa_gojefulogag_dalobur_vevosilituga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajixe/mesosupejufonowedigopel.pdf
    • https://s3.amazonaws.com/dobesogum/ziradodinafudewibomexu.pdf
    • https://s3.amazonaws.com/saxefi/43206838600.pdf
    • https://s3.amazonaws.com/zategafozasiru/psp_emulator_for_android_2019.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5fa.bin
ee2aa6ee4b5eb16c5c35c5ca5d7d9f182685fd9a37e544be95b2d7277ea85093		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 5632 bytes
font_01_sfnt_off0000d909.bin
237f234d697ab0309cf83b2afba0841562ea83271f49f81f03068de4545515c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 9840 bytes

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