Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03daff1f86a8286…

MALICIOUS

PDF

84.7 KB Created: 2021-02-25 00:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3cee620b1134ed1d1cb62aca21262d78 SHA-1: 2b56510265d0990becfa43a9d3b67c6131bbe8ba SHA-256: f03daff1f86a8286b7754b18f8ac73ec4abaf850036f6876e71bc1933359ed67
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various websites, many of which are hosted on disposable domains or services like Weebly. This behavior is consistent with SEO manipulation or phishing campaigns designed to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://leonvi.ru/wix?keyword=electricity+worksheet+answers+page+8 PDF link annotation
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/595684.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jhK3TCf/vanilla_cake_recipe_without_butter_and_baking_powder.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/jihljaP/buzzards_bay_tower_marine_forecast.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/nomawevine.pdfIn PDF document text
    • https://dawokopo.weebly.com/uploads/1/3/5/3/135314789/8388940.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/belajar_excel_dasar.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/7a6c3b7.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/6685309.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/ziwoz.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/pageru.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/e5thgqA/82242134024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_600669603dfaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffd6f2b97507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_600671e2e6fd7.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_much_money_do_nfl_players_make_if_they_win_the_super_bowl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevusup.atwebpages.com/multiple_intelligences_gardner.pdfIn PDF document text
    • http://deroxemonak.epizy.com/jovenemelumifiwadoneb.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_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 5604 bytes
SHA-256: f82bd2818479feb105b7ca34d4ba8e42913a15195307e0d29c020297641fdb10
font_01_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10780 bytes
SHA-256: 4ed7cdfce35a92bc89218457ec8a7f3d3801bfe908b31e9b7242da344a9895f0

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