Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e71cef0356b160…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 02:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b077a76882c2cc9c2579d1fc18aac5b SHA-1: 4f9ff2671bd8dce0b533a8e5d7106d112807eb48 SHA-256: a4e71cef0356b1602016165b16fc52eb21ae31455a588692af06a4547614f2d9
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains text related to search queries, and the embedded URI points to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed for malicious redirection.

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://botokaw.ru/strik?utm_term=calories+for+taco+bell+chicken+power+bowl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427821/normal_603798f249809.pdfIn PDF document text
    • http://negozio50sconto.info/noco_genius_3_bank_charger_manual065oe.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/vakirugezusiruvonub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe1c18460031.pdfIn PDF document text
    • http://wavepolabipal.22web.org/xerawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fffdc784612e.pdfIn PDF document text
    • http://lavkavkusa.store/skyway_bridge_fishing_reportsew8vo.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
    • https://s3.amazonaws.com/gavexilatuvitaz/dexopeja.pdfIn PDF document text
    • http://palakojum.rf.gd/bases_de_datos_en_excel_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/jazemorimanili.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/66593796697.pdfIn PDF document text
    • http://midekudaxigol.rf.gd/95237736445.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/mytv_iptv_apk.pdfIn PDF document text
    • http://roxigivakupumun.epizy.com/56480648558.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/un_oso_y_un_amor_personajes.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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 5208 bytes
SHA-256: 1565ae0ede188f9f84365bba312d3831b87558809815195c71ac81b30b11916f
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10816 bytes
SHA-256: bcf5dc1503f0364968ba1b42429153faf45b90ca5a257c3c4568e661d26104ac
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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