Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b394ac1d3c683e…

MALICIOUS

PDF

80.9 KB Created: 2021-06-13 01:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7bdd44764bb3a557ad15a52e8702c9ae SHA-1: 15efd45803f61de6431239046f46498f32a2ab3f SHA-256: 04b394ac1d3c683e405672ea61aae244664762a47b4ddcf11b516242b556c83e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to direct users to malicious sites. The presence of embedded URLs and the nature of the link farm indicate a phishing or SEO spam campaign.

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://pelibifir.ru/123?utm_term=resttemplate+basic+auth+spring+boot PDF link annotation
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/a6e0ffeda1a.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/kawulegudino_falizat.pdfIn PDF document text
    • https://faxovidovatage.weebly.com/uploads/1/3/4/3/134378957/fozibijego.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/dudabemorel.pdfIn PDF document text
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/jujokenete_kupuxefovovul.pdfIn PDF document text
    • https://bejidadona.weebly.com/uploads/1/3/0/9/130969139/e1c7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_605d75389aec9.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/4437a0bd9b.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/ab91a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_60bc08e63bee9.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
    • https://uploads.strikinglycdn.com/files/e162eb5b-3a3f-4984-a9a9-76dff633ba12/15114473891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ef0252-c7b3-403b-8196-89a3a6310b61/38252542191.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/w/file/fetch/144732819/how_to_breed_platinum_french_bulldog.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144552342/lana_del_rey_born_to_die_album_cover.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144455244/42222668807.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/145213440/lusorinokupu.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/webizafonadulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4621e5-9f8a-4dbb-aa93-946de3bad052/axial_yeti_xl_rtr_for_sale.pdfIn PDF document text
    • http://ronakiko.pbworks.com/f/affidavit_of_support_form_i-864a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115e617a-322f-4368-9ca0-8dd99a648f75/bivuvopomuzuvesirut.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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 5376 bytes
SHA-256: 43fbe6ba9c42bede3c3b844e9fa137dff7ad8210a44beeb37321bf4e4a3ef1a9
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 11100 bytes
SHA-256: 04f8f4c926850a75eb8f6e793be73a5ac817ae74ba2b4c40ab51cb3425c39919
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34