Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fb04e3fd98d8b5…

MALICIOUS

PDF

80.3 KB Created: 2021-03-09 00:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 61a56cee3a2c99264a6f43ff82d46bef SHA-1: 60f3c0a30191c85cc131914bb88e44b4223267c6 SHA-256: f1fb04e3fd98d8b59ea5d9a137175058c18408ca39cd5eaab3c2734d7ab3529b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://seumenha.ru/strik?utm_term=troy-bilt+pressure+washer+pump+maintenance', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=troy-bilt+pressure+washer+pump+maintenance PDF link annotation
    • http://niburufajanuto.sportsontheweb.net/65894646385.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/philips_series_5000_replacement_shaver_head_boots.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/the_merchant_of_venice_2004_movie_cast.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/jaxesabi/3399934589.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/boy_scout_manual_2018.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_3212969d02004b16b73066889a8e3f40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/ingredion_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/ssf2_v0._9_android.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/bluff_master_1963_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb46fd32-cdb8-42eb-84c6-78cb4d64ed9b/zexitepotibuzogidiguzal.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_695124a2ca564095893f140a771e2471.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/gosaginetedaga.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/phd_thesis_public_policy.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_c432b8d2e66b4bc78151ff60b95cee78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/84367087132.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_9fe2d8395535437f8f52d1f08c2e17b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/multiplying_mixed_numbers_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/xaserukovowop.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_acede8953346493aaef3910a564ac851.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0220ec-70e2-4be3-ac81-09cf35dd7ca9/2252654165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea65808-179d-41a3-92a0-4f5c656c40b5/67686283305.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_8a251ea88c3b4cbb8b789e5eebcb589f.pdf?index=trueIn 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_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 5488 bytes
SHA-256: b11a780a2795718ebca438c2ee1c434cdc0d4342f1f8abd9470aa27d35b7030a
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11072 bytes
SHA-256: 8a2d5763d985d5ab4fa58d3e514d42ee21089b8431912097488b33873e6bd33b

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