Malicious PDF — malware analysis report

Static analysis result for SHA-256 551d1a987e308b74…

MALICIOUS

PDF

68.6 KB Created: 2021-05-31 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d82e80e296dafb374021ef96a0041bb SHA-1: deb274e170f77fea282e1876a9167216e2a080d9 SHA-256: 551d1a987e308b748fd790c2ede3b8a63d54bccb53a9cc292c725ccd4a6b1c2e
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 pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/strik?utm_term=wagner+1700+airless+paint+sprayer+parts, is likely a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=wagner+1700+airless+paint+sprayer+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454049/normal_605fabf3b5d37.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/gejox.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/dinesatixa-lerepamak.pdfIn PDF document text
    • https://suduwigopoda.weebly.com/uploads/1/3/4/5/134587425/mafovitadaxet.pdfIn PDF document text
    • https://jesilezozuzi.weebly.com/uploads/1/3/4/7/134745232/d33233c9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fe2f7d6e83b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_6046a43ddec35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_600d59397b152.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/zozisejasinebig.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/fupisotewenam.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/42e85cc1-e313-4c3a-a576-63edbcd2ac87/how_do_you_turn_on_wireless_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf6507a-9be6-44d0-963e-9b13e89055d1/towulezedumep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cc73f3-d2b7-4096-bed5-bfb5cd9de217/no_manches_frida_2_mp4_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5dea06-6dc7-40e1-a73d-8727afc95475/93867192665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44d93cc-9098-4711-bb0f-9cbc1524c369/the_human_body_an_orientation_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b28f315-0556-4ab1-9dd6-c1254be3156c/estructura_plan_de_negocios_ejemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380651b3-b6a1-4bff-85bd-031027df9714/gexinirasafafexisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccef84d7-a365-430f-a59d-c8ec017f1454/velevovasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebda0e9-9c63-4fff-a89f-4c8c00d273a0/epson_adjustment_program_l380_software_free_download.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_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 5376 bytes
SHA-256: f0cec86d8169d5fa692b73756c91524ddd81f95d37f1b3cd4f88a37e1aa8d761
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10348 bytes
SHA-256: b6f9167fd4e726960aebce98da188c74eef35e67445de0d74ceb9b0f0884d42d