Malicious PDF — malware analysis report

Static analysis result for SHA-256 adec1d3aafd40c1d…

MALICIOUS

PDF

71.3 KB Created: 2020-11-19 23:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dddf5ec66d0a8bbb64b4a565456f11d4 SHA-1: d5750e3293e8965ac347e5f433d04fa97d7d1e1d SHA-256: adec1d3aafd40c1dc6753221178db534bbaaad1695ca6bb66eb9eac197dc27df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to 'traffset.ru'. This heuristic, combined with a high ML classifier score and ClamAV detection as a phishing trojan, strongly suggests a malicious intent to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a tactic to drive traffic to external resources, aligning with spearphishing or SEO manipulation techniques.

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://traffset.ru/123?utm_term=capricorn+in+12th+house
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f86f5792f617.pdf
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/8650928.pdf
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/xuronaxuji-pajutilolidof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/57353177-ab9c-40cf-9c92-2f7ad7d38195/myspace_app_download.pdf
    • https://uploads.strikinglycdn.com/files/f082418d-7387-4373-a508-abdf0e41a73e/gavupezedo.pdf
    • https://uploads.strikinglycdn.com/files/3c8cfe4c-dceb-4127-944a-0da12c6df2ed/12880094706.pdf
    • https://uploads.strikinglycdn.com/files/489e3c2c-59ca-4318-9013-0f61c5f0922a/nekomupufuzerirudodoj.pdf
    • https://uploads.strikinglycdn.com/files/6f0a1d37-fcd2-4f94-8899-c5a0aba45780/live_photo_porn.pdf
    • https://uploads.strikinglycdn.com/files/2595d048-f3d4-414c-a8b6-d868121d3222/69462263023.pdf
    • https://s3.amazonaws.com/runuzitexokol/57744255921.pdf
    • https://uploads.strikinglycdn.com/files/d06f29f3-52bb-4d37-9434-24c744395b20/dual_band_j_pole.pdf
    • https://uploads.strikinglycdn.com/files/ccf424cf-9311-4d85-ae19-d4a9cba6f4f1/sonia_nevermind_free_time.pdf
    • https://uploads.strikinglycdn.com/files/490b3bda-17c1-40a1-af64-356f26c1e628/appslib_apk_arnova.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9e.bin
90c7a154b4aa4613e67a2d42eb60dfc2077261a4e6b7c924c181c86da8823ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 5076 bytes
font_01_sfnt_off0000dedd.bin
c1deb0acfd6fba65ea5cea1a7f5a3af36d6b01df56a09b3d4f86ee55311c5ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 10428 bytes
font_02_sfnt_off00010275.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 4324 bytes

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