Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c928ed629a0454d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 15:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a493f42e1ea385fe057d59c1c7b8ef01 SHA-1: 2814b1e834b878cc8a1c40ae0810bb0295ccbbc9 SHA-256: 5c928ed629a0454dc1867d0f8aa7d99800e67d2bb202e95f6d1e71fb9895c704
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 SEO-themed and redirect to potentially malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary lure appears to be a guide on making a chicken coop door, but the embedded URLs, such as 'https://soxebez.ru/strik?utm_term=how+to+make+a+simple+chicken+coop+door', suggest a phishing or malware distribution attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=how+to+make+a+simple+chicken+coop+door PDF link annotation
    • http://kemamibuke.mygamesonline.org/how_to_get_the_new_rock_pet_in_adopt_me.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/1487c.pdfIn PDF document text
    • http://makamar.tech/ayushman_bharat_yojana_registration_formb697c.pdfIn PDF document text
    • http://qrastenmap.online/wiserezcirp.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/chemistry_handwritten_notes_for_upscstzyv.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/junupoxedike.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/5569429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff4dde73c24b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_602775ca4a1eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ff9af4a02342.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/vadurujutenefebasetumome.pdfIn PDF document text
    • http://sovetnik53.ru/68758940813sumo1.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/2ad56c8883c.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/zojameleroki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fde12a1aaa8f.pdfIn PDF document text
    • http://lavkavkusa.store/gokivakii3bwm.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/mewinegewudalexuzosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_600a533b7f9b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/47284642286.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/company_expenses_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/28007334561.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/javascript_date_format_output.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/41790581383.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/71977108942.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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5428 bytes
SHA-256: 949c7c74037d02aca5f0d8acd41a4cd790066ca62c5363692d5bb68f8d65a855
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 10108 bytes
SHA-256: e0004201353e603bbec6b138df24889e56b01044551a2ae9028e1c64711b8191