Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71a7bb733fe6deb…

MALICIOUS

PDF

73.9 KB Created: 2021-01-08 10:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d846fc8522717f5e326277d8b375ace7 SHA-1: 6eaa254c8dad0bed28eabd17ee1226dec57f1027 SHA-256: c71a7bb733fe6debc4de15206325948fcc5a02c0923979333aa05125de232761
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'August 2018 calendar excel format', which is likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffmen.ru/aws?utm_term=august+2018+calendar+excel+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f8e432b21c07.pdfIn PDF document text
    • https://zogijemomisun.weebly.com/uploads/1/3/4/4/134488733/nuxadixowizowax_nebonesitore_lelejumalabapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378827/normal_5ff7e51a21b0f.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/023710b61d.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/xojotugopuxofasux.pdfIn PDF document text
    • https://nuralizowipu.weebly.com/uploads/1/3/4/6/134693001/6016340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f9ddc386f581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fe8f553891f9.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/sodavaposetol-kusotawa-rewunaja-puwid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5ff083d633dcd.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/7795471.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/2292538.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/8c14f322-d6c1-4812-a5fa-959c70d8824e/get_followers_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c0e5d0-792e-47b0-939c-a52ec6eecd51/pepamesukafased.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3188db2c-c01e-451d-a278-49a73dddaf73/dedetogikijumizado.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5920 bytes
SHA-256: 298b2998f59339359006377eb1be8f3b594405249c7517800334bd466045ba8c
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 11644 bytes
SHA-256: 7cfcd4319d9362083ec8ef5018abeae8df03dd27437bb7ca2b8e732e06056132

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