Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f94efc972ad45…

MALICIOUS

PDF

73.9 KB Created: 2021-01-21 08:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed53dea368463d90bb2048aa833d4040 SHA-1: 90043b53229f7a9df6ab7aa7b77447b815c5259a SHA-256: 061f94efc972ad45bee6688040c16d918511990eab86b474b8cadc262a0f83d4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or services like Weebly and Mozfiles, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or traffic-driving scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=song+cry+lyrics+yeonjun
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f874f09e5d17.pdf
    • https://site-1232343.mozfiles.com/files/1232343/understanding_biblical_theology.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5fb605d05f196.pdf
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/bodarejevo.pdf
    • https://site-1176821.mozfiles.com/files/1176821/avengers_endgame_iron_man_hd_wallpapers_for_mobile.pdf
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/7201742.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/6b391d.pdf
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/c275dc065.pdf
    • http://sajitalunaded.22web.org/lagu_nightcore_monster_nmv.pdf
    • https://cdn-cms.f-static.net/uploads/4465003/normal_5fae4c41e704e.pdf
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/dde668451fc5086.pdf
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/2707516.pdf
    • https://static.s123-cdn-static.com/uploads/4377662/normal_60040b0f95397.pdf
    • https://site-1255529.mozfiles.com/files/1255529/26708509635.pdf
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/ginifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://guruwemuzotal.epizy.com/nijekujefapuropukixix.pdf
    • https://s3.amazonaws.com/temujonuwu/77676703462.pdf
    • http://zufejudo.epizy.com/tosawodenaxajemerezutit.pdf
    • http://degivenumi.epizy.com/2472346166.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_off0000d811.bin
eee21aee3f43c40c554ccba964f9dc125b5ca0af897471f30e2cd21d0c70d47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 4840 bytes
font_01_sfnt_off0000e88c.bin
7e766692c4e1d38ade4e227b428c6ea28a98cb4201d12703859093ec43ac2f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10632 bytes
font_02_sfnt_off00010ccd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 4324 bytes

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