Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c4eb32fd7b1a00…

MALICIOUS

PDF

74.6 KB Created: 2021-03-04 23:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8b8f8dbecdcbea46869bcac9f5591093 SHA-1: 06302a8ff48d7188eb9d2e24f00398e4f5577da2 SHA-256: 90c4eb32fd7b1a002bffe3b6ca8074dd0d8aa549aeab6ac6517845abf973a30d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs points to a search result for 'how to command prompt safe mode', which is likely a lure to direct users to malicious or phishing content. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/wb?keyword=how%20to%20command%20prompt%20safe%20mode PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5fe4842febe54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_5fd258bbed0f5.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/7d0d216399a041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_602050c8bb1b4.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/7105125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fe6ff56cb222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_6027660bc99b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5ff64b754c9a8.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/is_cricut_expression_compatible_with_design_space.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601c89cd7587e.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/target_spiral_ham_cooking_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_58f5f45284d0453eb4198392b6f46b08.pdf?index=trueIn PDF document text
    • http://fosisidevafepet.epizy.com/gakamuponovapodozowodezir.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_551f0454e6074b97b153f1cd3fad1e4d.pdf?index=trueIn PDF document text
    • http://karapazixegipi.epizy.com/bumper_offer_naa_songs.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_415ab94f88374f1383cb2454db43b44b.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_31e7fb96903a40f1a625964c638fca59.pdf?index=trueIn PDF document text
    • http://rukusogizowo.epizy.com/used_androids_for_sale.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_8589dcd6f9e241d88c8ba55a642cbaad.pdf?index=trueIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/edgar_allan_poe_the_tell_tale_heart_short_summary.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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 5320 bytes
SHA-256: 04baa1d9783bdc8fc7ab0b12d8b7e674c7e48773e0ab29dfd986f49d6f11478b
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10456 bytes
SHA-256: a556c0bb64591548183133b6af68df942d4b96761b4c76976441929a1e69211f