Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa79893c14cea3b…

MALICIOUS

PDF

77.6 KB Created: 2021-05-28 07:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64eb16ed2c9bb07a70f67caf232c46c1 SHA-1: 7d9c7401ddddfb7019d9482eb67708ee909c0daa SHA-256: 0aa79893c14cea3b8455ab998ac1ef061f28eb1cc655005b625378ee3842c386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are dynamically generated or point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+set+up+penn-plax+cascade+canister+filter+1000
    • https://cdn-cms.f-static.net/uploads/4375531/normal_60567b4ecf37a.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/zudixapumu-miviv-jefekamepavig.pdf
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/rinema.pdf
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ff88f0015a8e.pdf
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6016de4326c72.pdf
    • https://cdn-cms.f-static.net/uploads/4449170/normal_6039ecc87f7f5.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_605dcb19dd936.pdf
    • https://cdn-cms.f-static.net/uploads/4424330/normal_600e8d4f09ed8.pdf
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fd1e16075e85.pdf
    • https://static.s123-cdn-static.com/uploads/4455381/normal_6001e06d4fbe0.pdf
    • https://cdn-cms.f-static.net/uploads/4461773/normal_602c78379eccd.pdf
    • https://static.s123-cdn-static.com/uploads/4415944/normal_5ffd0177eb0c0.pdf
    • https://static.s123-cdn-static.com/uploads/4410952/normal_5fd0817bcdd15.pdf
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/5619522.pdf
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6044da1124c29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/05820d6d-d430-49b5-8613-550373a8f5b8/ponniyin_selvan_english_part_3.pdf
    • https://uploads.strikinglycdn.com/files/0e725673-741f-4e81-9de9-90ee13d970ce/zanixokar.pdf
    • https://uploads.strikinglycdn.com/files/44c1b3c0-2d8e-451c-a11c-842a8f9a0207/what_is_the_importance_of_knowing_the_principles_and_elements_of_design_brainly.pdf
    • https://uploads.strikinglycdn.com/files/ce0b0aab-26f0-4813-9b87-fcf3d14fb928/daniel_planta_wrestling.pdf
    • https://uploads.strikinglycdn.com/files/94a31dca-bd53-4b84-be24-66ff0538bd5d/pci_basit_iletiim_denetleyicisi_driver_indir_windows_10_64_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c8.bin
39ee1ca04edda232808aa87458943dd97c738aa1a3b81841755045d097e8d3f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 5496 bytes
font_01_sfnt_off000104a9.bin
8b348d9d0aa39e25e748938d905598abb4cd43ddbc457bdf85fc286d4262ac16
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10692 bytes