Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c99142b4b1dcb03…

MALICIOUS

PDF

70.7 KB Created: 2021-06-13 09:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3963cc18daaf4bab19f763b6bce4739c SHA-1: cc54d5cdf49f32e6b800e5d8e58e95c3d24775c0 SHA-256: 9c99142b4b1dcb03586fb992062fbb9f03c16e4546806543af9516e071475ce2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=all+channels+tv+apk PDF link annotation
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/ba9f92b89456.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/7180459.pdfIn PDF document text
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/2141899.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/kobitalebupakem-jilawo-bomakej-raboliteje.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/2943731.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/vesaxaji.pdfIn PDF document text
    • https://rinilevewabidu.weebly.com/uploads/1/3/1/3/131382630/rutavagireke.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/6113313c9b7cc.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/eeb9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajaweridadi.pbworks.com/f/call_of_duty_3_wii_iso.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144469851/76694752860.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/how_to_study_beta_hcg_report.pdfIn PDF document text
    • http://gomedaj.pbworks.com/w/file/fetch/145227696/mmg_self_made_vol_2_download_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157cc805-441e-422c-ae1c-333a5832c6d8/a_simple_favor_book_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bee8314-6f2f-4c8a-8e9c-2f0c0950e89f/bodyboss_ultimate_body_review.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/how_to_replace_belt_on_kenmore_gas_dryer.pdfIn PDF document text
    • http://matekid.pbworks.com/w/file/fetch/145236174/secret_calculator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a471766c-6daa-4335-a6d5-698d3f7735ef/tokyo_ghoul_opening_roblox_id.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/71629532524.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5040 bytes
SHA-256: 9c48b02f53cb6b1ac8dfee4beb8ee4ccd8d2e03bde8bf6d8d00009fbd2d74e0f
font_01_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 10496 bytes
SHA-256: 4be782fefee7b6fb793ee63d8430b0230cfec9ad52566b9bf948606e05d403fb

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