Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc20cba779843cea…

MALICIOUS

PDF

74.5 KB Created: 2021-05-25 00:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2cb1d8e7463134a2356f2905cd3243be SHA-1: ede4db42b1a3eb6da04c9142a8000f6ef97fa2e0 SHA-256: dc20cba779843cea9055acc1e9836c9c3d1404fed0994f107b3332e59dbf1f2c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=how+to+remove+penile+papules+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459062/normal_60651aebeb763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_60507e965b706.pdfIn PDF document text
    • https://tidurikax.weebly.com/uploads/1/3/1/8/131856133/mitububidovudijo.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/jufamonowexi.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/fd2888.pdfIn PDF document text
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/viziguzeraxuliloba.pdfIn PDF document text
    • https://todonuratalojin.weebly.com/uploads/1/3/4/6/134605818/5478944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_601d3d30d4a0a.pdfIn PDF document text
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/guvorekavozata.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/5d72edb3018e30.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/84754f309df6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471464/normal_60114e41db8e3.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/04d87da2-7d8c-47ce-a54f-9e5de98db13c/xunuvijilasisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31e323a-dd2a-49ec-acc6-fe2fa55ef4e9/31441712414.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/24116837450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795d7ecc-6532-4906-8cbb-31dd102952dc/hamilton_beach_6_slice_easy_reach_toaster_oven_with_convection_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff3467c-947e-4caf-bfba-7b32ae6c76db/on_the_road_jack_kerouac_film.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/atrial_fibrillation_esc_guidelines_2011.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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 5172 bytes
SHA-256: 35625029b7d9da7e3638e4ba57cb80ab1c30270b918a4d27c080658b455ae2bd
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10312 bytes
SHA-256: c290528ec42718946e7fe13712726009a153fc911ec552526755498260e37543