Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3977bd8c678c76…

MALICIOUS

PDF

58.6 KB Created: 2020-12-16 13:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cd6820090b9f00c45077f8717dfbefa7 SHA-1: 1a8f1a09050cb3a44805056158fb1568f156b042 SHA-256: 0b3977bd8c678c7667de63c0487f8cf368c200e59e879d9ee03001368b365881
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text is obfuscated and does not provide clear instructions, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=echinoderm+review+worksheet+answers In PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/fafigavetematod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fd9a480f0e6b.pdfIn PDF document text
    • https://junalupi.weebly.com/uploads/1/3/4/4/134460459/8145910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fc183932b022.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/xevozutifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8dcf7d841d0.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/kulabuso-nopuxipaja-kimarik-dixobudene.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/7467893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3b2b6a13a450bab05afe1/t/5fc9e1001a258d244fe0f907/1607065857273/howler_monkey_sounds_mp3_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d3b3f9866f3fd2dadad4/t/5fc38f43f8cdb769c6513929/1606651717106/elapsed_time_word_problems.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b5bec30a162e0c519083/t/5fc1a84c9d79364840cc4314/1606527052412/72435220421.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/lakezuniwebizivinoko.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_off0000ab19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB19 5320 bytes
SHA-256: 4ff4445bf6908f822a928a6795d8950d90deee1a2245589d42001d69e883e0a7
font_01_sfnt_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 9612 bytes
SHA-256: 91bdfae1c222c128b6921b66fadafed86cb3ba8aa765b6468572113a4ef366d5

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