Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06c8857ad3a18c1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-11 16:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fac1246b66812677f65e4cc167972fd2 SHA-1: f01d4602981881f395d794931e648524f0d7b142 SHA-256: a06c8857ad3a18c1c2eb8a0686e047c66bf87c535394ab75586490fe99e02407
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits multiple critical heuristic firings indicating malicious intent, including links to known malicious redirectors and a PDF link farm. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though malformed, suggests a lure related to an 'English speaking course', likely a pretext for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=english+speaking+course+bangla+pdf+free In PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/5159698.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/bibaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fa375b9cd85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f9008946c24d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5f9eb98b6f841.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/7805117.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/59053fa9.pdfIn PDF document text
    • https://witorovi.weebly.com/uploads/1/3/4/6/134643219/biditaxetugabore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_5fbd23e28a45f.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/susopuzupure/tojusasepenemufabeja.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/sawgrass_movies_showtimes.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/60425164205.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/larsen_toubro_ltd_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/45036993902.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/horrell_hill_elementary_school_hopkins_sc.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_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5580 bytes
SHA-256: 7367d8987dbd9f1b96c01e0acc2ae290f236904724173c22eaa9cc535c853760
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10284 bytes
SHA-256: b3a5e8b5f494d236cb6b9280a754f1387d551dbc45ec3d83401c2538901fdd8b

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