Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a17bc406776c5f…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 16:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5fc8cc566df1bf7389221f9497d0938d SHA-1: d1acd9aa3e400f939073013c080e319681fbcf0a SHA-256: 31a17bc406776c5f3ed208506cd3b37bf9a0b10d8cf0f6f95713f30ed813f241
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://golowaki.ru/aws?utm_term=what+is+a+cv+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424027/normal_5fd92e46656c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fe01cef16db2.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/466fea7.pdfIn PDF document text
    • https://velawoturo.weebly.com/uploads/1/3/4/4/134478902/02be8.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/6807687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_6048f4c1d43c2.pdfIn PDF document text
    • https://dukupifit.weebly.com/uploads/1/3/0/7/130775427/gibawudova_beron_sazebokivu_biseju.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/0b6c40c60fdcfb4.pdfIn PDF document text
    • https://suxomaloki.weebly.com/uploads/1/3/4/5/134598925/wubijakiwuwux-fizozar.pdfIn PDF document text
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/miwaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_604d7ba0cfb4c.pdfIn PDF document text
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/6280658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fe0c3fd5fe41.pdfIn PDF document text
    • https://zajutarox.weebly.com/uploads/1/3/0/8/130814803/20c1ee941f.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/34db0250-a5b4-44cc-b8d8-77ac4774e61a/navien_tankless_water_heater_not_getting_hot_enough.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/xemasoxisudexanifelesa.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/android_sdk_install_platform_tools_command_line.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/isometric_plumbing_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/zubogozonemix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24426520-5427-4539-9aec-ac43f4bbf32a/lifetime_adjustable_portable_basketball_hoop_54-inch_acrylic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470530ff-6798-44fd-ab15-04841f032cd8/what_movies_are_playing_on_amazon_prime.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/2546118079.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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 4528 bytes
SHA-256: be165b487d46994751725da874a9ecf6c5ac6d3a2fe2a2fd9b68d6b72f105cf1
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 11744 bytes
SHA-256: 1d4ce7ca88fad72d53607b761aecc725981a1b3a9808b4cc2ca46f2e0c8b5088
font_02_sfnt_off000129b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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