Malicious PDF — malware analysis report

Static analysis result for SHA-256 3176141e404cd103…

MALICIOUS

PDF

93.4 KB Created: 2021-03-14 11:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03b7a4363c8bab4ce486ee5dd8b4e51a SHA-1: b048db1924f2de5c389db73ee393341a9a9a4d31 SHA-256: 3176141e404cd103ac35c455e1aaa54ce37e49a5ec8fccc2711e8686dd637f39
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=corpus+linguistics+for+elt+research+and+practice+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471959/normal_5fddce522560d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_60229930e13a0.pdfIn PDF document text
    • https://vokavize.weebly.com/uploads/1/3/2/7/132710687/gojami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_601f530e1ff3b.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/wedatufenivo-vofezowin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_6035b4b1391e3.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/4c356563214882.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/7340164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ffc2c9c25f46.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/ryobi_2800_psi_pressure_washer_user_manual.pdfIn PDF document text
    • https://konoxitewe.weebly.com/uploads/1/3/4/4/134494736/gavolibalopaw.pdfIn PDF document text
    • https://segoluremu.weebly.com/uploads/1/3/2/7/132740478/govarur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pivimufe.atwebpages.com/18094830271.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/1846_illuminated_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c442c3f7-b90a-40f0-96b1-d8aae70e07d1/19134200341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678d1a42-d033-4c6d-a4d4-ab8fe8e4b9fc/how_many_electrons_can_the_p_atomic_orbital_subtype_hold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c04b75-421c-41cc-8b01-47fa9157da3f/pefibexapajabijiminopas.pdfIn PDF document text
    • http://girofili.myartsonline.com/how_to_get_merit_badges_fast.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/schaums_physics_for_engineering_and_science.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 5320 bytes
SHA-256: dbbe073aebe98e24648f6ae8d933f7a89b187ff775d244a69dca0f0fd7ba536b
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 12608 bytes
SHA-256: e90cf3d1846d04e3a0ef6a52e239463ad057a636feadfb7f31294d3840937dc5
font_02_sfnt_off00015a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2