Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a1beb2a166b17…

MALICIOUS

PDF

83.5 KB Created: 2021-03-28 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bbb903fd0dbdafca7f53b527de6abb4 SHA-1: 50c36af1ef8daadc399ed626fbe964602f67be04 SHA-256: 9c1a1beb2a166b17d3649c43da14c3e8062f24f83ea29d9e75ee1e28bcd72124
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, many of which point to Weebly and other hosting services, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the document body, though heavily obfuscated, indicate an attempt to redirect users to potentially malicious sites. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=attack+on+titan+pdf+piano
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/6384052.pdf
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/6897622.pdf
    • https://malodarugamizo.weebly.com/uploads/1/3/4/8/134853004/sigejesav.pdf
    • https://kewoloxonesafuf.weebly.com/uploads/1/3/1/6/131606745/sipuxijolurine.pdf
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/8729027.pdf
    • https://newovedisi.weebly.com/uploads/1/3/5/3/135348170/kesarofujoxokazamuf.pdf
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/9801965.pdf
    • https://vimikova.weebly.com/uploads/1/3/1/4/131437612/9339798.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fibesezati/31779041828.pdf
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_bf13b35ee9974cfba115eeca56fad649.pdf?index=true
    • https://s3.amazonaws.com/petikamov/kugexepokatudopozol.pdf
    • https://s3.amazonaws.com/poresi/waterpik_water_flosser_tips_amazon.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/amsco_us_history_answer_key.pdf
    • https://s3.amazonaws.com/dipafuxe/kenwood_ts-450sat_review.pdf
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_68e2e290aabb4cb0874180b88ea37834.pdf?index=true
    • https://s3.amazonaws.com/ropuba/53177230611.pdf
    • https://s3.amazonaws.com/bubeto/what_is_meaning_of_sisterhood_in_marathi.pdf
    • https://s3.amazonaws.com/nafibanefexex/boulter_boilers_camray_2_manual.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/what_is_a_special_warranty_deed_used_for.pdf
    • https://s3.amazonaws.com/zonebon/bolufedevodo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e969.bin
b7c046bec2210fd7e52d29732d626bb699f42f7c89a8eccb21606acca285a26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 5240 bytes
font_01_sfnt_off0000fb8b.bin
092e626658cc9f6d496f985697f8329c0400dfc7c3d5b839f89a7b5ffc8def16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 4564 bytes
font_02_sfnt_off00010b1a.bin
96594acc9eea26d4eed88964576ed2fe0a0f70bfb7d276dfdf4eedfef086e5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 11624 bytes
font_03_sfnt_off000132f4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F4 4324 bytes

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