Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d262d0c0fa4705e…

MALICIOUS

PDF

79.3 KB Created: 2021-05-21 10:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d1bb35a0d0c4f98041848813ea3346f SHA-1: 9da8d9dacfdb1f1f65d6f550beca05c1b1dbb05d SHA-256: 1d262d0c0fa4705ea87a299a085fc62931c4eabf8604e15222c267b129a3d831
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/strik?utm_term=how+to+get+free+money+on+avakin+life PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393925/normal_602d0f54e3bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_603c52f32c9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_60492a9785773.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/6606084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481821/normal_60076a1408d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_602105ce555e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6054d0abb5da8.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/wuwewapawoxizemaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fd5f4cac78cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lulelepese/fesupifolajekivoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585dc4ae-cd5a-4e9f-952b-ca51102f3820/learn_english_free_with_usa_learns.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/difference_between_relocating_loader_and_linker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4678e5fc-0c0c-4239-a023-3693fec59386/62760531720.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/pofiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/27123874098.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/annual_planning_calendar_template_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/elasticsearch_search_template_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2843aa17-1939-45c3-9f34-36daa1297ffc/36865344224.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/63137049693.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/ap_biology_hardy_weinberg_practice_problems_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/bseb_10th_result_2014_marksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 4976 bytes
SHA-256: 8c13cbcbf04015def16e4b2bec7bcf0f5ac00e9eebc2cee10c6683627fd74150
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10908 bytes
SHA-256: 52cfad7a08608592e02db566d2fb297d3a87a9e2d5f43dc697d268c81fad2a03
font_02_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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