Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a74ff11b64afcf…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 09:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2cdd092c1e80191482720f3b55a098e8 SHA-1: cb51b1365549b36b02a31a72c6f82e029997c76f SHA-256: a0a74ff11b64afcf57b0d16a660cbc6150aeccec4aa167cd648241a3548a81bd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/123?utm_term=countable+nouns+worksheets+activities PDF link annotation
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/7241665.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/nekunuxuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/ghjdwjf/birds_of_prey_soundtrack_youtube.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/sebodugolupur-pakasuze.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/uHWgeij/sokisiguluzufu.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/billy_graham_sermons.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/coulson_and_richardson_volume_4.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/6562088.pdfIn PDF document text
    • http://majikok.mygamesonline.org/how_to_edit_mp3_on_mac_with_garageband.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/216efba3-4348-46a5-b6bb-99e1ecae98cf/how_to_rig_for_surf_fishing_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab632e0-6db5-4180-ae73-5f99b5e86b52/what_is_5c_code_on_samsung_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b7d822-6f31-4df3-9003-1e7f7fc5685c/girl_interrupted_daisy_chicken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b54793-19b5-4163-b300-539b24eae550/kuligoxikokara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1c31b2-70f3-42f1-943c-9c8c91178361/49920279191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceee8267-8612-4d7b-b422-50c3486c90be/vermont_service_center_closure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4c3850-c232-40d7-86c2-db4b8e83f017/chromecast_h2g2-42_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c58da1a-bbac-481b-ba32-f21ed0eef696/81086478721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488370cc-b866-4902-a23b-7e8fe069f0a7/how_do_you_make_coffee_in_a_hamilton_beach_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff864b-723f-4b43-aba1-b58349564628/tixekovuwefodikuposef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fea6bc-b12d-4203-baad-03c7247526e5/vesipinefusupexof.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5148 bytes
SHA-256: bbbf38431ecafbb620789525a39c2a1e3a6404d8d2f4c3a1990f5cc450e05182
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10896 bytes
SHA-256: c5b75fa483d3a0525dcec391816dfaa0337f20727f7ce9bfd8b6d35b8bac0b0b