Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d551b828a4ed615…

MALICIOUS

PDF

95.9 KB Created: 2021-05-26 13:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1be70dddabda202e94a34573ce04cf7d SHA-1: d62fcb75b22b9d11ef0e4d5e81ce78243b920637 SHA-256: 7d551b828a4ed615d5dd1beef169e0b61eb5cc439729fc838c45e548e9d92ae4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of the primary URLs, https://pelibifir.ru/strik, is flagged as malicious. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host malicious links rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://pelibifir.ru/strik?utm_term=partes+de+una+iglesia+cat%25C3%25B3lica PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5fef0b3d0cc12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5ffba65b2c407.pdfIn PDF document text
    • https://damowovevibip.weebly.com/uploads/1/3/0/9/130969764/2269462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fc7ff79b7871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_601b292b93eb6.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/6ab0d5948d329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5ff0afdc247b3.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/renibumatele.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/9637302.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/zomedex.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/niwotipugonuvoz/tafejo.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/24457685482.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/79044292416.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/lobuzedujuk.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/chalo_amarnath_chalo_amarnath_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/sciatica_back_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/nadidukubupafupara.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/84228522850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df58212f-fb6c-4f82-a733-bb9919ac00cc/how_much_for_a_retractable_awning_installed.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/27197531462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb6a2d0-8af4-47ef-b5c7-9150656dd637/mosevufoponevij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e11070-bb7b-4a60-8f1e-2e5642c293ca/358587132.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/37762402398.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_off000137ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137ED 5244 bytes
SHA-256: f96d01155f039eb83ae2ff5c3d0f8e4351422894268c7b74786615a509f5ae21
font_01_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 12000 bytes
SHA-256: 832a9c6915d9989d723e1ec8b60cd8895a3eed922ead5a80e53f0002ad36e096

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