Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b5137f5fe3c065…

MALICIOUS

PDF

71.4 KB Created: 2021-03-06 13:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0e0629f69aadbc8b09782d13b8898030 SHA-1: d88db4ca8098fe22cbad853e2ed553697151a407 SHA-256: 69b5137f5fe3c065d4d94a19f1c79c5c8b6dd1c68cefd5357c3a7758cfa0c400
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be a "refrigerator manual" which redirects to a URL that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/wix?keyword=admiral+system+2000+refrigerator+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454302/normal_6040a801c3ec6.pdfIn PDF document text
    • http://deteluwo.iblogger.org/appvn_apk_7._0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_5fdb1adaf21a9.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/dP4iegd/lijasetatuzatuxivowim.pdfIn PDF document text
    • http://gotiwekiz.iblogger.org/zulit.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/4plggG3/45970987217.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/lijifugokal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405902/normal_5fc897535a8f1.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/PhgGTjd/45989065070.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/ziwudopukofofupe.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/c72d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fed1b9e18989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wavunot/dell_e5400_laptop_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/yellowfin_tuna_price_per_pound_2019.pdfIn PDF document text
    • http://kegotetebam.epizy.com/89492200705.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/beautiful_love_couple_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/child_care_forms_and_publications.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/free_business_plan_template_for_poultry_farming.pdfIn PDF document text
    • http://moxurux.epizy.com/livaselibewulubideru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 5476 bytes
SHA-256: 1325889a8f705fe6439005dc7c8148593de70948692c04449eee0d6ee2af95ba
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10040 bytes
SHA-256: 0085c2779c9b75321ae6837a2d5ae400b8a675cebd8b4751967ba16833b6e4c7
font_02_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c