Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dc0a2cdcf520cc…

MALICIOUS

PDF

94.1 KB Created: 2021-03-20 00:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 338d4a157a268defa98e6ddb5632fb52 SHA-1: 7e84abbed58e8e27c382655a3c312748051aaf9a SHA-256: b1dc0a2cdcf520ccb6f8bdfd674e5fecb1d9f03310e8fcaeb670c969990f46c8
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 one prominent URL pointing to a suspicious domain ('resalured.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'current affairs pdf' and the authoring application suggests it was generated programmatically, likely to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=affairs+cloud+march+2020+current+affairs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367944/normal_6024913de679c.pdfIn PDF document text
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/f0a5fd939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421048/normal_5fc70e36018b6.pdfIn PDF document text
    • http://predouche.xyz/how_to_look_up_serial_numbersntd45.pdfIn PDF document text
    • http://stixlife.info/pizosuwotaripp9r0.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/43571313193fej5b.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/2567455.pdfIn PDF document text
    • http://daravto18.ru/mewanapojiwd5dau.pdfIn PDF document text
    • http://reliables.ru/what_size_battery_does_a_g-shock_watch_used25uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480142/normal_601314d6b9663.pdfIn PDF document text
    • http://mangalvpodarok.ru/72239282191kb6av.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_af4e21b49f3f4146a1abb27be856bcf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulazelof/functional_analysis_exercises_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/66558257695.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_8a04b2ec36e54d2e95cf1931b469ffd0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/3532900848.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/16626919981.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_21dfee7f58874ff79d98ae41f0379b94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/21944249264.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_0ec181c1c08f409d80d7a56657b1a609.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
    • 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_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 5660 bytes
SHA-256: 5682f02af02ebfca43b4f83d086428d648c7772a40c943ea0defb723dda6a93c
font_01_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 11796 bytes
SHA-256: 45f1d607fb8a852f4063e5ba5c581f7aa4ac5eab5f88fbeef97fbd1e378e11f7
font_02_sfnt_off0001537b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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