Malicious PDF — malware analysis report

Static analysis result for SHA-256 172b1811eab62a7a…

MALICIOUS

PDF

82.1 KB Created: 2021-02-25 23:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d858fbaeb5074e91387c59f85a83c24d SHA-1: 70cfa4c558af35c209d8d1c0d957b0b89a95fc30 SHA-256: 172b1811eab62a7af7bcc3f601d87d2e0dbf9ec84613bf7bdebb643508f591e6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting it's designed to drive traffic to various websites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=zgirls+mod+apk+offline
    • https://cdn.sqhk.co/duvetezoje/eggjfjg/melurigot.pdf
    • https://cdn.sqhk.co/weteroliwo/2hrgf3v/bumijibaxuxedozevajureliz.pdf
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/zizapirurezuk.pdf
    • https://cdn.sqhk.co/pilozarager/hhgdhcb/archer_hotel_new_york_rooftop.pdf
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5feec8d0a9303.pdf
    • https://cdn.sqhk.co/zujubiviv/tjhibjc/tangled_2_movie_trailer.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/1dd0d1bc.pdf
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fcea4189c172.pdf
    • https://cdn.sqhk.co/depadukat/hjbhgez/wukexas.pdf
    • https://cdn-cms.f-static.net/uploads/4367273/normal_60279cd76a107.pdf
    • https://cdn.sqhk.co/gutinisiv/Shaiis5/knife_wielding_man_attacks_police_chicago.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_6011820feb9ce.pdf
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/1235708.pdf
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5fceb3d3f0eea.pdf
    • https://cdn.sqhk.co/novozefox/etgejb0/dhoom_machale_baby_toy_phone_ringtone.pdf
    • http://vudujupuboneg.22web.org/party_flyer_template_psd_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://nixuverojezuluz.epizy.com/favawilenekaluge.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4a.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 2952 bytes
font_01_sfnt_off0000f6d8.bin
c90dc0f7bac334a48ac5ba98a509ce49057c8837057cac8419b7decfbdf274e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 5384 bytes
font_02_sfnt_off0001090e.bin
6122aa50f76dbb4884d712b74bee156a93bf868ada25df812280d52842dd06da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 5756 bytes
font_03_sfnt_off0001177a.bin
b98f72ed063aa00f8ddc784836c323ed4e290588aa70a21ce7e36d69447cae01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 10284 bytes

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