Malicious PDF — malware analysis report

Static analysis result for SHA-256 569ffccc89ace401…

MALICIOUS

PDF

74.0 KB Created: 2021-05-29 12:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3485d41f7fa5135c06c72280c5891505 SHA-1: e1852bdcc3a964123669318a1a3569dd2f26891b SHA-256: 569ffccc89ace401c5908c8a05a3a6763baa2c7c045b69e3345bd2ccd91b42ef
186 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external URLs, including one on a disposable domain, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to writing a reference letter, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=how+do+u+write+an+appointment+letter+of+reference PDF link annotation
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/8817547.pdfIn PDF document text
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/1643496.pdfIn PDF document text
    • https://guxikotazo.weebly.com/uploads/1/3/4/7/134704652/redulozanakafi.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/wimikejuwepol_nidamivufowute_gapowurepaline_pisexexutiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_601b62e89e977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_605573f07c52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_602b11cc517c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fcc5e7e95544.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/6f681536c217e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5fd178a46526d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5fc620434716e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_6023f4ddb5f5c.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/ce6070fa63737.pdfIn PDF document text
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/aea231f317b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0cdd7a-ea69-41de-9419-55d3f61c4388/dejupejedozojebevabonuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff86006-1378-41f7-9cdb-222bdc5fb415/dell_optiplex_790_usff_datenblatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e597c8-2dd6-4751-950c-cbadd70dcafa/grohe_ladylux_replacement_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa46f4c-b613-4d4e-9c8f-df0c6fa984e0/original_lincoln_logs_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e437dd29-3333-42ad-a205-f3f5652980e1/how_to_answer_behavioral_interview_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240f67cb-33b6-4627-82a3-c5ca3c0f3a39/lotiput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e86d490-5815-4736-a63c-6163533c2c8e/how_much_is_a_samsung_ce0168_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a96cb9-36b4-4dd2-bba3-8a0cb539cb7b/fedex_tracking_not_updating_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dac08d-dea5-4808-8440-9fafda233d19/1014324914.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5176 bytes
SHA-256: f7ae11275d93b7581a34f9b125a9c9a31b988e946a79a343c8b20a56cdd3a414
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10396 bytes
SHA-256: f30af6ff5e1384059a66ddd3ed1a390412108c29d95ff644859794bf4311c907

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