Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d0a6abcddadc51…

MALICIOUS

PDF

68.8 KB Created: 2020-12-20 09:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 41d695b9c77c621fa35eaad06619aafd SHA-1: 17d078555fa1243336a514aceb9b547f16d05dcf SHA-256: 31d0a6abcddadc5155d2034c0994842011dc8a5a9c343b96cddf81fbb95df1aa
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, along with the ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=google+employee+handbook+2019 PDF link annotation
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/leroxejavabemubarisa.pdfIn PDF document text
    • https://vasoderavir.weebly.com/uploads/1/3/4/7/134728489/7ea95.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/3719004.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/visosazaxojot_tabug.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/8324808.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/firukusu.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/bemoza-latalixapovik-vetuwoda-nafogagiwatem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidivo/magnificent_marvelous_matchless_love_sheet_music.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54038c89e1c4b8fdb3a59/t/5fd73a9cdf2f0204c2516d79/1607940766371/aira_butterfly_valve_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/xanubikapivalusevidogikez.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc656352cf09257bd907783/t/5fd18a84b1f6926771506832/1607568005016/71568300068.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/68604420435.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 5920 bytes
SHA-256: ab97edb0fe0b91c6def2072fcdec7eac8e173859f63cb95fb1f5892752a7931c
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10276 bytes
SHA-256: 564b550be14d40647188ea65cbf66afdf6b11c4feed79c7d5da4599cdd1ab7d4

Open this report in the interactive analyzer, or submit your own file for analysis.