Malicious PDF — malware analysis report

Static analysis result for SHA-256 642231512533fed1…

MALICIOUS

PDF

95.7 KB Created: 2021-05-30 04:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5f3a11c20f5d511713c393c59a3b4029 SHA-1: a2c946e75ce25ab81907ebe7af073c45a6101375 SHA-256: 642231512533fed1145ba645c4f634e989d2617b5a8217803ad948481163429a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL and link farm structure point towards an attempt to redirect users to malicious content.

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.
  • 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.
  • 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://lozipotod.ru/strik?utm_term=skyrim+how+to+get+blacksmith+elixir PDF link annotation
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/xurujafoladizo-sunifajijubike-mefamot-kebaxog.pdfIn PDF document text
    • https://pajodutakimileg.weebly.com/uploads/1/3/4/4/134474341/vizakodomisoduwu.pdfIn PDF document text
    • https://vavixama.weebly.com/uploads/1/3/4/4/134471840/dodefurugijevo.pdfIn PDF document text
    • https://najafasow.weebly.com/uploads/1/3/4/3/134325135/2019494.pdfIn PDF document text
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/dixolezu.pdfIn PDF document text
    • https://xabesokexiba.weebly.com/uploads/1/3/4/3/134327988/vesusani-mijep.pdfIn PDF document text
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/1189da43d81f5a.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/7942623.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/gulaliro-pofavif-lapajaxoguw-kajarulanagil.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/2667194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37316122-568c-43c7-a2f7-657afc9c046a/reloading_equipment_on_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d879b43e-556f-4291-b5be-72a949779e79/90128523385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fb2313-d955-4df6-82c0-a2f0de51ab76/how_to_find_piriformis_trigger_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed7667d-64a5-4aeb-8c5e-aa9c06f660f5/html_element_select_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5fb571e-2c42-4c07-aeb2-20a93f667e99/risafusebaronafokasapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8053783f-c9e6-466e-af3c-8c9e3893e438/are_bryant_furnaces_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc7538d-3cf7-43ee-b748-d419f99b7fdd/67573551841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e467d00-ea7f-4f42-8509-b39dbdeb90e8/art_is_good_for_the_soul_quotes.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_off0001362b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 5780 bytes
SHA-256: 73acf04a3bf2d4d9b1beb94133577215383676a991b6155f5e727d003ec6f1d2
font_01_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 11640 bytes
SHA-256: 3500775450bbbc0ba950e8254c47f4458f51af68920f927bf96ae9432832261c