Malicious PDF — malware analysis report

Static analysis result for SHA-256 968d03a63c7d58dd…

MALICIOUS

PDF

87.2 KB Created: 2021-03-25 06:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ffb85072569774ab25b4707950f71fa4 SHA-1: eca9a413160629f2fffabd9a27be230abf9c5831 SHA-256: 968d03a63c7d58dde534182c8244a03fe6380caf069320c9ed54faccb2af3658
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/strik?utm_term=black+baby+boy+names+that+start+with+m PDF link annotation
    • http://komunomaled.iblogger.org/l_attrape_coeur_j._d_salinger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fd3508bbe658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6023cd5e453dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60280ecb16c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd1f2c1bee33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c0237c3fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5fdd3a5b3a141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_603b1596139d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_6046778ef38a8.pdfIn PDF document text
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/sowitiwuno_mebokedovijeju.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/3867325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443341/normal_5fe511b00e74a.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://tepusijanakigat.epizy.com/orlando_airport_live_flight_information.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_10875b14dc4d422d89b2704245d4677f.pdf?index=trueIn PDF document text
    • http://nivomoj.rf.gd/nerawole.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/kufobemivada.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/93594088057.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/14896326616.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/are_king_generators_good.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_f363b49191824c87a5f15b730d4a0d96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/6236115618.pdfIn PDF document text
    • http://zuxamivim.epizy.com/silovomebugekixopizosuru.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_069a8ecbe8574f2e9d6eca6ebf801a53.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_bb73aeb402b7403596176dfd75e12466.pdf?index=trueIn 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_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 5272 bytes
SHA-256: 29ae1ab049c10cbc166b0dd9b78adf6564381c43f2617c42b50559f28ed59720
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 10780 bytes
SHA-256: 90f062433ef1713dd75561fe9873b5e625982d9bb66dd53cf708abcfc733e3d6
font_02_sfnt_off0001413a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361