Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ba1e4ed0bef172…

MALICIOUS

PDF

85.0 KB Created: 2021-06-04 04:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2222947adf0143c05014d3cdae38187e SHA-1: adb5e8f6e24dc23fb02e1843454c36d3b0c942a6 SHA-256: 93ba1e4ed0bef172a36d66add1d78d89ec28de43c60ee4d99d28928910f30c63
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged the PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/pbw?utm_term=amman+pattu+tamil+song+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485005/normal_6023e435c3ff5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413374/normal_60b508e9c3834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_606e89db96634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd26908b0291.pdfIn PDF document text
    • https://jinerepesejo.weebly.com/uploads/1/3/4/5/134576949/ab65ad3edd.pdfIn PDF document text
    • https://naviguxiva.weebly.com/uploads/1/3/4/2/134266723/xitosezibajugin.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/pamonudak.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/1ea07c940df2da5.pdfIn PDF document text
    • https://joxaguxurotaz.weebly.com/uploads/1/3/7/5/137507581/1181bdd5.pdfIn PDF document text
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/355352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_6002aa5be2fca.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/jofilubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_600d90ccb8907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6050a70c5d6dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siseraxoru.pbworks.com/f/dominos_pizza_phone_number_closest_to_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d1fdcf-a593-4b99-8df7-21342be3a4f1/othello_act_1_roderigo_quotes.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413991/set_up_google_home_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74abc0f8-18bc-4099-aa46-9707ad857f0e/6591209954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217ab0fe-41f4-44d5-aa04-2bc6e6465d4c/39598233135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a628c7b-be0a-4438-9775-189277d96267/82610309082.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 2976 bytes
SHA-256: 1ae8ea2c979c6f19458fc99958a3c6e3b6b394bd61fae3b0da03f6ee002a5180
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 5232 bytes
SHA-256: 67dec833476f9085e297cb2ee5c866802b2494fffad07d7e958571667e16a185
font_02_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11744 bytes
SHA-256: cd2b14a9170cbdd3ae44e9aa6d8176dee60bbee1e744bec782e2c267ddf5208b
font_03_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 18912 bytes
SHA-256: c588917b0722b3fce5c9f5f171b048a2a057b9cd204d06db9d4352f04445f6fc