Malicious PDF — malware analysis report

Static analysis result for SHA-256 41191a5d852113a0…

MALICIOUS

PDF

81.3 KB Created: 2021-05-28 08:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29723c5c7426c14390e4e453463543f0 SHA-1: 5859bb66f01097adf929b1f750965b39f4fcf5f9 SHA-256: 41191a5d852113a05749ee27e7962b221b1ecf8b23cbde085f7f685eee231d8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to 'assessment in special education'. The primary goal seems to be directing users to a network of external URLs.

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.
  • 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://soxebez.ru/123?utm_term=assessment+in+special+education+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5ff527b28faed.pdfIn PDF document text
    • https://rubirilubuz.weebly.com/uploads/1/3/4/2/134266621/nebixetuzesujiposaz.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/8f636eaf.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/8fe07e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_606e2bcc4d385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_605c192454fb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff492faa3825.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/fodakaluriwak_nemumelave_kazemojiz.pdfIn PDF document text
    • https://xokijawajix.weebly.com/uploads/1/3/4/7/134726357/7505094.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/wukimizinubevimebag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_602726ea4125f.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/jugusaf.pdfIn PDF document text
    • https://jadikabejoza.weebly.com/uploads/1/3/2/7/132740193/lepizade.pdfIn PDF document text
    • https://kavuwaxexo.weebly.com/uploads/1/3/5/3/135351152/goxuwekutelova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd66771a2778.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/kigopasabozesegobiw.pdfIn PDF document text
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/5c9ba529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5ffea3ec26b84.pdfIn PDF document text
    • https://nenesasexogo.weebly.com/uploads/1/3/5/4/135400776/3773327.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/04cf2c86-3499-48b1-abfc-d50601c004f6/74850703792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68968312-9ac5-4fcd-a03f-c872b643efa9/cuanto_es_1_pulgada_y_media_en_centimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c586cb8-0ca5-4d2e-83ef-cf3e820c77c1/vcds_vag_com_18.9.0._max__hex_v2_usb_kabel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3fee82-f63c-488d-bbcb-dbb0dffffedf/what_is_the_velocity_of_electron_in_the_first_excited_state_of_hydrogen_atom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c629a22-ad6f-43cc-b612-ec9923978fa0/charlie_and_the_chocolate_factory_characters_then_and_now.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_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 5196 bytes
SHA-256: 773ee74df58ab3af7d2dac2d40dc3e4ea6233d4916c8e1824c119436db007cdb
font_01_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 11276 bytes
SHA-256: 4db6628936be1ad6eacb45eb854382d66b94eebb8f2dce1a8f3d311285e343b3

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