Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1d37b35b1a0c2…

MALICIOUS

PDF

98.1 KB Created: 2020-12-26 16:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7913494fabf2e84083cac19d99dc5def SHA-1: 248a0f296e64f3dbf4ec079311e999dac7644ffc SHA-256: edf1d37b35b1a0c204055a5105fd68d102f69857add31f28c5271fc99e695b99
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable or potentially malicious domains. One URL, 'https://ggtraff.ru/aws?utm_term=cyanohydrin+formation+equilibrium+constant', is identified as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=cyanohydrin+formation+equilibrium+constant In PDF document text
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/viloliworafoluza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f9f85cf3289b.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/hb7Oygc/kopefolajotiramozi.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/247401.pdfIn PDF document text
    • https://tamatopufav.weebly.com/uploads/1/3/4/3/134386909/8019725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9b3b88487e1.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/2809362.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/730aac6822.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/f071c5.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/581bfb63-996a-414c-9e4b-6a06959b3d04/63403138133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7be7c68-ca3c-4bad-a510-05fedfb20eac/23561850678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f909453-6bf7-4cfb-b36e-4529079741a8/rufus_king_high_school_football.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/xiradox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c169a21-a65d-434f-9b73-0f4f55305adf/69416658783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22332b77-b527-46f7-95fc-ba4e174cd66d/painters_square_montmartre.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012a42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A42 5532 bytes
SHA-256: b9d8e2973f1b9b1a4f1f602b56e6166ffb7d9e6564b0842575d2f99717cc6dbe
font_01_sfnt_off00013ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE5 11756 bytes
SHA-256: e52fc83d356b9a965cad4d4e02fd872c00966cbfe54a712064795f5a6a8c9e6c
font_02_sfnt_off0001654c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654C 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080