Malicious PDF — malware analysis report

Static analysis result for SHA-256 f832780f0bb3798a…

MALICIOUS

PDF

96.4 KB Created: 2021-03-13 15:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca58925530fd2dc963fa12476982d0bd SHA-1: 81b186210a1c26d282f7e1d17ada24dc87e4fe37 SHA-256: f832780f0bb3798a2f1e87674bc0847c9fba70889d19a0432941f3c3def99fde
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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/wix?keyword=eastern+flight+401+voice+recorder PDF link annotation
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/c4804.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/kin_prefix_definition.pdfIn PDF document text
    • http://walletelectrum.buzz/ginuwine_the_senior_zipp44d0.pdfIn PDF document text
    • https://vamepaxokuwi.weebly.com/uploads/1/3/5/9/135959455/6494893.pdfIn PDF document text
    • https://kijapipova.weebly.com/uploads/1/3/1/4/131407887/vodeboxipamajuperuno.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/84265308951.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/chickens_for_sale_mnulwtx.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/adobe_printer.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/does_china_have_5000_years_of_history.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/xixigokeris-nubusibunamuto-nuvixirew-fanatu.pdfIn PDF document text
    • http://rokamik.iblogger.org/platero_y_yo_english.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/0765ef58-b863-4778-b974-16754f719ee1/special_quadrilaterals_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbabc98-c050-4380-b0b3-682b4ffa97e2/vesogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e05fc15-7b52-44fd-a01c-17d38ee922ed/nawaxifuzewebegufumalafe.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_877cd232b68d49b9971c469bb3bf17a1.pdf?index=trueIn PDF document text
    • http://sesukunijekoti.epizy.com/suronevode.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_edc5034931984c2f8ee1c776e6944fc5.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3969d3c08e74449f805e016c14f4ea82.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/acr_form_delhi_govt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daec16eb-a57b-4fd4-a6bf-4e7a66274def/30262925646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7da292-9507-4209-9ca2-9ba6559f580c/6624214974.pdfIn PDF document text
    • http://likijanima.epizy.com/27854418057.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_0181fa94e8a0477caa2da29de90454e5.pdf?index=trueIn 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_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 5580 bytes
SHA-256: 5171cb95ab2409a5f968ee2361745dcf56d751f8f51355482364ad468fd0e609
font_01_sfnt_off00014e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E34 11048 bytes
SHA-256: 9cafacd77dbcbf6c0ae200e946b2ec78c55a239346442dc1b9befbd6e5ceff47