Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ef0d9666c21cb1…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 21:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f65a56a5272104967abdb67e9f2964cc SHA-1: 4f027702412f9ffeeabaca9eedb88dee152e422c SHA-256: f1ef0d9666c21cb13ad04e991c1aa16cbbbddd2b8765432664f55e64313097c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to facilitate phishing or malware delivery. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=dometic+penguin+ii+15000+btu+heat+pump PDF link annotation
    • https://cdn.sqhk.co/bozawenibiwa/zjbgiij/cross_roads_baptist_church_valdosta_ga.pdfIn PDF document text
    • http://igafnd.org/64539529796d4onb.pdfIn PDF document text
    • http://niwapona.iblogger.org/51920909595.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/xelepoxafanepipage.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/9833086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6017f83c3e7b0.pdfIn PDF document text
    • http://itwow.info/nurego5z7l2.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/dkIkNja/plague_inc_the_cure_is_a_lie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5fcf7828a5400.pdfIn PDF document text
    • http://dijepitezuk.22web.org/11330659951.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/6958771.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/6rijhfO/43935179366.pdfIn PDF document text
    • http://blognews.top/wivemudijohix93.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/ihhahja/dinosaur_battlegrounds.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/648192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://petizitopebil.epizy.com/73940865757.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/pinodejumaboj.pdfIn PDF document text
    • http://welolazudadiv.epizy.com/9850547666.pdfIn PDF document text
    • http://bufafaloverodi.rf.gd/ffxv_armiger_unleashed_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5380 bytes
SHA-256: f84d102abea4164cdc6b90318f7127905ebea2228c7e6ecddbf3aefb7dac1e9c
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 12444 bytes
SHA-256: 26eabc0df56f8b1050a95e46ab7399ee4c60298bd640019dceadcf8a0c18f7a4
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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