Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d3686f821f353b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 22:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2469ac724f64bb92d81de5974bd109de SHA-1: e3002c6ce57dcd70af4ecb852ecfb8898d174fd2 SHA-256: e6d3686f821f353b556c00c41b9b67d91ca73b4998d8412c5d112ebd3daa1db6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. One of the primary external URIs, 'https://crophysi.ru/award?keyword=german+adverbs+list+pdf', suggests a lure related to 'German adverbs list pdf'. The presence of multiple external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=german+adverbs+list+pdf
    • https://cdn.sqhk.co/kekotenonaxu/jguEY1b/bass_pro_shop_near_foley_alabama.pdf
    • http://vakotuwudar.22web.org/s_letter_dp_images.pdf
    • https://cdn.sqhk.co/difejekexe/dWVlAzm/9704182563.pdf
    • https://static.s123-cdn-static.com/uploads/4451574/normal_5fcd44ab56ee6.pdf
    • https://cdn.sqhk.co/norumuwapa/jhja4FM/bitazejinajego.pdf
    • https://cdn.sqhk.co/fepexeguma/igk8VDz/39227612759.pdf
    • http://dekagexagupeje.iblogger.org/android_studio_jdk_location_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4454301/normal_604951e2ae7ba.pdf
    • https://static.s123-cdn-static.com/uploads/4482219/normal_5fdca332405d2.pdf
    • https://cdn-cms.f-static.net/uploads/4447649/normal_601e78eecf9d4.pdf
    • https://cdn.sqhk.co/rivojotewez/haa0jji/cordial_cherries_with_clear_liquid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://juzujodajemafa.rf.gd/uber_stock_earnings_report_date.pdf
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_727140080aa845d991faa09f1847c982.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f2bc087-077f-4047-9c8a-7cd3a34660db/forty_rules_of_love_elif_shafak_quotes.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_d47fac5c370a4366b38f235a768040b8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0a46d9e-5167-4939-9504-a7ed37556d82/acrylic_nail_places_near_me_prices.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_363d4d9c3f574998a922c99cdce65b32.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_fbb41a746f694636ac2401618b74dc85.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_8910c5b33c284d5c8e468a4fce5b53d0.pdf?index=true
    • http://kafudunafow.epizy.com/25748564832.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_off0000e3be.bin
c086742d3b68348e2970c5d77cf3fee77cf2a1c8a539848e6dc40659dc1413fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 5096 bytes
font_01_sfnt_off0000f4f4.bin
1b8c2dff427d4fbc3ba4ec5cc9089717ee5b16d4d8edd238fbcc02b01cc323df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 11664 bytes
font_02_sfnt_off00011bb4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 4324 bytes