Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdf0d77f4e3b762…

MALICIOUS

PDF

72.5 KB Created: 2021-01-22 04:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4f1eab7f7f20249e8db585f8c9b2927 SHA-1: 9039533227a0f360d59cc1cd8537c2a737e08164 SHA-256: 1fdf0d77f4e3b7627243595f270f15f4bb075fa50dcebda3c9f5cb3491c9ba29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to reference product details like 'Ipad mini 2 16gb wifi', indicating a potential lure for fraudulent sales or phishing.

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://trafftec.ru/123?utm_term=ipad+mini+2+16gb+wifi PDF link annotation
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/dejupobujigomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5fc7dbfc78b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5fdcf4604ebde.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/68419555662.pdfIn PDF document text
    • http://sezewadiwun.22web.org/92207315242.pdfIn PDF document text
    • https://site-1175983.mozfiles.com/files/1175983/jebopexineziw.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/96118755750.pdfIn PDF document text
    • https://site-1179234.mozfiles.com/files/1179234/business_strategy_analyst_salary_amazon.pdfIn PDF document text
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/xokaxim-nokukolez-tojorifenotolo-gozisuj.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/d06a8eede99.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/90048357188.pdfIn PDF document text
    • https://site-1178419.mozfiles.com/files/1178419/xeguvotowujitebirimiba.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/pawusopugilazuj.pdfIn PDF document text
    • https://site-1179507.mozfiles.com/files/1179507/fogatesiwafutijuwugakin.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/wexobugado_pikidutali_wuwutubil_zotapafabim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafeseg.rf.gd/20420748225.pdfIn PDF document text
    • http://faxumev.epizy.com/acknowledgement_legal_form.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5560 bytes
SHA-256: 90c38ba1b9cd973dc79d0a149a78ecf015bf6302053b8634f9a4499597b3244e
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10856 bytes
SHA-256: 14ec9cf7bbdf90252a4c708d2e071ecfea37d5ff91738eab00e0600e41c8e69f

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