Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3a7b978635add6…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 17:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fcbc426562ddd83a4eda1d67c6f7d240 SHA-1: ab8951e1e833f020741b25b765bf6af895568add SHA-256: 4b3a7b978635add645487dbbaee23b3b06863a834b96231bf4e372071c6e744e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=d%2526d+warhorse+skeleton PDF link annotation
    • https://cdn.sqhk.co/wazuvegox/hfhcnhk/53144167669.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/hchdWic/47154256431.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/i1k9oza/baldi_s_basics_classic_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/gibiiwT/45763516910.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/gefkyhh/minecraft_pocket_edition_lite_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/jhdhds0/gizexiresepefe.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/dgcB7CM/94001426614.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/jaadja8/4346469236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_39e08491203e46148cf3974d3f6eb81a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc945884-118d-468b-b25d-74871856a960/charles_darwin_descent_of_man_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/32248521823.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_6fc9586515af4db3a030a8d34ff4b8c0.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_a59b2f9d53694ff1a51f69d31957d65e.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_b24df48e300441f4984a87b3bb4ca747.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd8f7d8-81dc-45fb-bbef-26678a84cae2/para_que_sirve_el_magnesium_citrate_oral_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdbb472-1b58-4487-80f2-90fc94bcf397/does_garage_door_remote_have_batteries.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/project_management_risk_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/are_lattes_with_almond_milk_bad_for_you.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_bca36f2b49c045f9a2b04e3c7e2edf04.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_d856ac2886184f9f97c5b7273753189b.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_c3e0009e5a564d4caad6971b0dab3ee6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/72118328713.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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 4156 bytes
SHA-256: 3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10832 bytes
SHA-256: dad1661fe8fab340347b44ac43c1a832d216f6090bb94a9fc18fdfbe139292b4