Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c3703a5522fd0d…

MALICIOUS

PDF

111.1 KB Created: 2021-04-10 19:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 15ab2ba179c325a328d169ee62063870 SHA-1: 69392b72fc0387fd4069c1ba1c9bdb1ae622d8e6 SHA-256: e6c3703a5522fd0d7918603fb683bf242747463b4b492a73db32da4da1fb8f42
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. While no scripts were directly extracted, the nature of the embedded links and the ML classification suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=star+wars+edge+of+empire+core+rulebook+pdf In PDF document text
    • http://devivitonewe.sportsontheweb.net/62239161748.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/1888651731.pdfIn PDF document text
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/tigenajoxiju.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/readings_for_sociology_8th_edition.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/1281726.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/25703647472.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/fekufekurojekij-jipufupafu-tufivinatulab.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/fukezavazuj/91817965917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a74009b-3966-4389-9036-23091f260b2b/how_to_use_a_ritetemp_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bad08c7-b11c-4528-933b-94c31d8044ba/inorganic_chemistry_examples_in_everyday_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a76466f-a2f7-4990-80f7-53087d937ce6/does_damon_fall_in_love_with_elena.pdfIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_0eb06bfb3be549a0989622337d35495a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9f444e-b251-4b36-9692-e4baf2df0fcc/nilovuzokesasanema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c3089-5696-4c87-8d91-f414d1b86482/fapatotepebolen.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_be424d26eb89484a8dfac45e543e8549.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a3f15f-773e-402b-aaa5-73a021d35764/vomudilopozisuriwuvamiwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4f532a-86ad-4e2a-8b14-464d6047c108/how_do_you_connect_a_countertop_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/17950386116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcf82d7-f5ce-4927-826c-095bfe5a30a0/xogabetetojig.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/music_for_sight_singing_free.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_off00017427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17427 5872 bytes
SHA-256: f324a3f841fe14ab1102e18d6510e1a123b3a7fad2b082fd513d27bf562f0ba7
font_01_sfnt_off00018823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18823 11040 bytes
SHA-256: cc3bcc4d5b379e890ebd376df92c4c091bde049722a9a20beae34df1b3487227