Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92e8f3ab26318bc…

MALICIOUS

PDF

61.8 KB Created: 2020-11-17 20:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e36d79f9dc78affbb79818abe0ad7b57 SHA-1: 1b8a3e1cf1cfdaa7e019aea616ba2bdf30ca5be9 SHA-256: e92e8f3ab26318bc2bb54920612223b597841ba9b63375245a4ead52c1d6798e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to 'traffine.ru' and a link farm pointing to many PDFs hosted on S3. This suggests an attempt to direct users to malicious or compromised sites for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://traffine.ru/123?utm_term=laws+of+exponents+review+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5fa37b4910e93.pdfIn PDF document text
    • https://wotufoxak.weebly.com/uploads/1/3/4/3/134308946/9df1c7048796dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f8d623dca8f2.pdfIn PDF document text
    • https://dokoxinizim.weebly.com/uploads/1/3/4/3/134305801/wawivu_ruxuzaselopasik_jimapom_pimibotinazikem.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/henghuili-files/zegog.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/action_research_in_english_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/rotogulom.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/texas_bill_of_sale_for_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82bffaaf-ea14-4d4b-970d-f9718c805805/62484420019.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/lakeland_school_district_272_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/nejilimoteronanomoga.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/26656571814.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/10721988217.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/idolmaster_shiny_colors_reroll_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123eedf4-c72b-4784-b3fd-808eb67559ff/fallout_4_colette.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/52783573419.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/85443494652.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_off0000b6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D4 5184 bytes
SHA-256: 237d70eb13c4996f93a8897b499dd723c35045d769cf0b5822907f35570579c6
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 9784 bytes
SHA-256: ce2ff00a5ecde55ee26468107fb441752a825b89f5553b2a847a631ef047090f

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