Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4382b16b4c22d90…

MALICIOUS

PDF

106.1 KB Created: 2021-04-06 07:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48bb081f2a34805314742a110e90a57d SHA-1: 7aed5ab7a97f961fbb6839db8da398125228c2c1 SHA-256: b4382b16b4c22d9067d4781f04fed5317e5eba5e1a9b28abc2d3105034d7ff65
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting a link farm designed to redirect users to potentially malicious websites. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of external links points towards an attempt to exploit users by directing them to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://maypoin.ru/award?keyword=cardiovascular+reflexes+pdf PDF link annotation
    • http://ragananutirud.iblogger.org/26988492848.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/3hc9hiB/egypt_running_out_of_water.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/8030443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_600edaec3fa4c.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/vulegumifuxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_603bdccdda651.pdfIn PDF document text
    • https://tavafawenu.weebly.com/uploads/1/3/4/3/134395038/d548d.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/ggI84gc/pobrecita_meaning_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_606ba6058ce63.pdfIn PDF document text
    • https://nakuzimatixibo.weebly.com/uploads/1/3/5/3/135388853/60cd1d7163df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416154/normal_5fc745995382d.pdfIn PDF document text
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/9c46b19d24ca.pdfIn PDF document text
    • http://xivoxuvawet.iblogger.org/fonusuxikekufibuxogewup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimomog.rf.gd/the_aeneid_translated_by_robert_fagles_audiobook.pdfIn PDF document text
    • http://fosekor.epizy.com/85585398860.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_off0001607b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607B 5180 bytes
SHA-256: f15ad15ce4803606de3c21ccba87a68d2f323cf445c5565a9cab526144ac9f98
font_01_sfnt_off00017236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17236 11884 bytes
SHA-256: ba2bfb75837a95063fe29be0ccef31c1e029ab69d225822bdd0b0cad229d728a

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