Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb372eec1b65e7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-09 01:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f45e9ed521c8db22a5c59cec77af3943 SHA-1: 6ec74aad602f62977138a94e5797ece607a7ec0f SHA-256: 0abb372eec1b65e700404f267d765228f1b45ac715138bb51e5ed39cd3312b08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic point towards techniques used to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=terzaghi+bearing+capacity+factors PDF link annotation
    • https://gurisowumar.weebly.com/uploads/1/3/4/6/134686590/mukefibidifapuzo.pdfIn PDF document text
    • https://metozalolak.weebly.com/uploads/1/3/4/6/134610510/8900984.pdfIn PDF document text
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/4602918.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/aygd8gi/snowflake_ipo_price_range.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/J84GheD/chrysler_assembly_line_worker_salary_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/inJclpD/guilty_crown_male_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_3f10c8ebe5f64a548ad808249cb01c40.pdf?index=trueIn PDF document text
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_c5f18696ee304e178e0953d46843c689.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/sibiro.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/mipinonanujidixum.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/50203532868.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/swordburst_2_guide.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_e1f8075d5bda49e19b9b523f83241d3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4f6f59-6ed1-4e67-b29c-735e6ee49e9e/bolens_garden_tractor_parts.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_2982b7c5ce7943af8f7d09d5c639b469.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_967280cc11a14e299d0ce62a32040f03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6e8393-b6b4-48af-8361-9c50357ff0ba/31851509483.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_98c68528dc9546bba347bb2f2ddf527f.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_d9c3f56a477442bc830627c92e5e40ff.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_af503f8150684fad8ad8005887131f87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cf13d6-f568-47d1-a5c0-a574cc236a29/sunrise_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/sogijazegexulenajivax.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5484 bytes
SHA-256: 45bb9cb81d78b295e58eff1ea8a22635328b01f470e7daf83467db875abeb4dd
font_01_sfnt_off0000fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 11412 bytes
SHA-256: 7ec52e0b22082bbb09888e9b9f73841ad2936b5898825a9c1547590bf997ca7d

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