Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c3a6ea9abd5b4b…

MALICIOUS

PDF

101.3 KB Created: 2021-06-09 16:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df45caa397a6de2170e0d56469d88209 SHA-1: d13d1847a61291315ac9e30a814fe1947eec55a1 SHA-256: b3c3a6ea9abd5b4b95ddc4a5ec126c0eaeff0d597e37ab6bccd8e88430288bce
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, disguised as song downloads. The presence of multiple external links and the ML/ClamAV detections strongly suggest a phishing or scam campaign aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=ilayaraja+hit+songs+mp3+tamil+download+isaimini PDF link annotation
    • https://vujufosidomo.weebly.com/uploads/1/3/1/4/131482916/6946697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_605d6deb5af1f.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/tapemifidote_meruvomaj_xemuzom_mirisorim.pdfIn PDF document text
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/6125607.pdfIn PDF document text
    • https://lonapumerupa.weebly.com/uploads/1/3/4/8/134853684/sigalize.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/4eefc7.pdfIn PDF document text
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/8bba9bf76b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe7ff902aded.pdfIn PDF document text
    • https://xudisuwovoj.weebly.com/uploads/1/3/5/4/135400752/f8c14baa329c1.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/5700672.pdfIn PDF document text
    • https://posokiveborog.weebly.com/uploads/1/3/4/5/134584549/8349287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_6019c7d195a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fd0f1954c7f4.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/c18d4133.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/ee248583-318f-47a0-939a-8f0a067c8f6c/7712799866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54316d89-8347-4e5d-a46b-edaeb0b4a62a/xafutebosabivi.pdfIn PDF document text
    • http://bazibenis.pbworks.com/w/file/fetch/144873624/39205118075.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/how_to_read_york_hvac_model_and_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50849d21-0b80-4da5-a35e-299742817653/how_much_do_nurses_with_an_associates_degree_make_in_florida.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/1582646670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d1eeb2-da70-471a-89de-2c7d18bda12a/41864815521.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 5744 bytes
SHA-256: bb5ee95921dfc7efd8be4f80c86817b5160dec31b0ad9b64e2aa1107dae50a7e
font_01_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 11024 bytes
SHA-256: b23f0387cb65279909ef541c3d26d2b8606675670160f8b1c89955b1345983dc
font_02_sfnt_off000171fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FA 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c