Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc3771058d30ce…

MALICIOUS

PDF

87.5 KB Created: 2021-04-04 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d71c913c7d392b62e97d71a358006600 SHA-1: 20086d71cdc41d5ea708ffe7ca54dd6a75568ed4 SHA-256: e9dc3771058d30cec06826d12c24f98301161f15597e7c1729dfe10167afdfa0
196 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing trojan. It contains numerous external links, including a link farm and an SEO redirector, designed to lead users to potentially malicious sites like 'gimoguvi.ru' and 'myyshooop227.site'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=jitterbug+perfume+tom+robbins+quotes PDF link annotation
    • http://myyshooop227.site/7867689388jabt7.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/kapawowexi.pdfIn PDF document text
    • http://frankiearvelo.com/jodexudegeselukgjb23.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/gabogowuli.pdfIn PDF document text
    • http://zozitaze.mypressonline.com/successful_algorithmic_trading.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/tapazagodulor.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/wugajutagapew-woridip.pdfIn PDF document text
    • https://lakafirawitekir.weebly.com/uploads/1/3/4/0/134018328/aeaf565.pdfIn PDF document text
    • http://guparob.mywebcommunity.org/south_africa_constitution_1996.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/2954402.pdfIn PDF document text
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/vexemorosi-felijudal-guveze-gokirugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_cf55a405d7424d40b8581fb1f24dc806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/kukapabetuzugadoxazofome.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/72532355608.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/dimensional_analysis_worksheet_2_work_shown.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/gradle_in_android_studio_folder.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_41309396bf6e4c319648e51eab2121e3.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_4d4d28aa3da14d11ba2d4b99f5892ef3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/gipulasugowesomu.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_f65238900ac84127968bb90efa9fb7b2.pdf?index=trueIn PDF document text
    • http://jifisuxevizek.myartsonline.com/24298802726.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 5236 bytes
SHA-256: b414794b3d61d25be53683247077c9efbec5f6611f710b743fcb23caba470dd1
font_01_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 15352 bytes
SHA-256: b214d8fa264899bf022ddb985d856ee622cb88b939723e5b35e833e168c63ba3