Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd9f9a72a7b7090…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 06:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cdbf4189fbf28158e3f2e8d0d68ed7a5 SHA-1: b8833b64e5883eb8857592f62171111142f4a719 SHA-256: bcd9f9a72a7b7090c53ff36a467674ea110da57ab718a8be45ab56dc99ea1624
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine rankings or distribute malicious content. The presence of a link to known malicious redirector infrastructure and a critical ClamAV detection further supports its malicious nature. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=calendario+ambiental+2020+pdf+peru In PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/tesiluzivotopexit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6019d0242891a.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/s9jigjl/64363730620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_604d96fe04be6.pdfIn PDF document text
    • https://madudezogimune.weebly.com/uploads/1/3/4/3/134326665/migijagovunidob.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/yZ7iazy/pockets_billiards_fun_san_antonio_tx.pdfIn PDF document text
    • http://igonlinesupport.com/gokano_points_generatoro0x3x.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/fhhqnhe/linking_verbs_worksheet_answer_key.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/sepatugarekuragupog.pdfIn PDF document text
    • http://dreabling.online/14314264477aikvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fd7b7144cef1.pdfIn PDF document text
    • https://dupujemewo.weebly.com/uploads/1/3/4/0/134040979/sumobipegapis.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/wusepabojajanug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_60342175de80d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fcb2afc5b058.pdfIn PDF document text
    • http://theplafond.xyz/the_feeling_of_what_happens_summaryhpygx.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/zalomi/email_format_html_example.pdfIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_1146257593e147d691bd620d2e847392.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/ancient_egypt_civilization_worksheets.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_2ef7e14c4dd247a285435fd7fd693c45.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_1087997c21e444ea937ff6f90dcc8a9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/fisojesesaxumeruli.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 5328 bytes
SHA-256: 549d68cd75a888ff3f4daf46b3f518df56b2329a9d1aba39f6d3be14f11297be
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 11756 bytes
SHA-256: 4573144ec2255db88b2ed18ede789453a07b0463bcd320bf8661bd60f931399a
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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