Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8e4c8565b1193…

MALICIOUS

PDF

87.5 KB Created: 2021-06-03 04:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b8c670db22626e10e556099a3b88d97b SHA-1: b2c23ea6ea0a2a350d90ae5334445ec572850288 SHA-256: e4e8e4c8565b119382bca01b343c7daa58e6327e93f0e6123c326cc2996b19dd
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/pbw?utm_term=how+to+replace+a+kohler+shower+head PDF link annotation
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/ec53793.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/a15e250d.pdfIn PDF document text
    • https://veliwomi.weebly.com/uploads/1/3/5/3/135343105/83ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_6042fc862ae39.pdfIn PDF document text
    • https://rovinimowi.weebly.com/uploads/1/3/4/6/134682499/5053104.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/da16a361ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_60b807bc02317.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/2c59bc491663e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_605f4573122d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5ff585d879d0c.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/afacdfed-9d65-4401-a146-ca7f0dab0190/clicker_universal_garage_door_keypad_reset.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144533400/rifosaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17866bc-63bf-4f99-a43e-cd2257f8b240/samsung_a10e_front_glass_replacement.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144421581/93543761029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a538c6d2-1e90-4914-80b3-6c11fc9958f7/mercedes_w204_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d504c1e9-85fe-4b62-9546-926f35af4c3b/commas_worksheet_2nd_grade.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/algebra_2_lesson_10a_worksheet_direct_inverse_and_joint_variation_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c31dd8-a290-4a4e-83a6-e58426eda372/honeywell_wifi_thermostat_not_showing_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ced6b7-03a8-4863-be9d-5576a60a0ae2/sefojutusifewonuf.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/ramayan_chaupai_lyrics_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c995bc-5863-4094-bf5b-a09a37816f30/webububimubaxatina.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_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 5280 bytes
SHA-256: 192a19a765b60c72b1eeabc2389da6640d30bdb1e03ee2fbe7f00dc80a94413a
font_01_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 10924 bytes
SHA-256: 2ef7ca28488b7453e2d40ac89daad38772bcee7d6cf6ccf837a953eb89591178