Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c47af7b354003d…

MALICIOUS

PDF

74.7 KB Created: 2021-05-18 01:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b3d0b91ddefe2cef784a09e846cf72b SHA-1: a2f1c0cfe9d5c28e524b3454e9f79817ce982f0f SHA-256: 29c47af7b354003d49e480774caac3051cb3332379e1fb8327ea1e43af960820
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 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to 'Manthappa medicine book pdf download'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=manthappa+medicine+book+pdf+download
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/190382.pdf
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/45293488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/musoxifuvitalo/kufofevugakibijuxone.pdf
    • https://s3.amazonaws.com/mesixadelomomo/29352468992.pdf
    • https://s3.amazonaws.com/novifamigot/battery_saver_android_app.pdf
    • https://s3.amazonaws.com/vinejivunitego/when_one_punch_man_season_2_netflix.pdf
    • https://s3.amazonaws.com/tuxutedi/how_to_learn_social_skills_aspergers.pdf
    • https://s3.amazonaws.com/wemofodi/sutenolulabafe.pdf
    • https://s3.amazonaws.com/mexesazaxasa/24791389282.pdf
    • https://s3.amazonaws.com/lupebesu/62934579585.pdf
    • https://uploads.strikinglycdn.com/files/4bf024d0-1093-496b-850c-0e785a1ee191/canon_430ex_ii_used.pdf
    • https://s3.amazonaws.com/vexosafugunu/tuviguguju.pdf
    • https://uploads.strikinglycdn.com/files/b0f433f3-f2d3-47bb-abf3-ddaccca87f00/87165056009.pdf
    • https://uploads.strikinglycdn.com/files/be2d7a25-7f20-44c8-ae8b-662663aa9795/how_long_until_babies_fall_into_deep_sleep.pdf
    • https://s3.amazonaws.com/guwutivupudutu/jopekojerezolot.pdf
    • https://uploads.strikinglycdn.com/files/5709e33e-e560-413a-974f-c385a49cee38/craftsman_12_inch_sliding_compound_miter_saw_with_laser_trac.pdf
    • https://s3.amazonaws.com/bitajemisajoz/woxel.pdf
    • https://s3.amazonaws.com/baxegezivumi/30521499589.pdf
    • https://s3.amazonaws.com/dakebesuvum/topudefuwamaginefageben.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a1.bin
c86450933c99b3ee54ff74c42a85a6ebaec6cbc5ebb41ae6301a16a8bcd3d2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 5420 bytes
font_01_sfnt_off0000f60a.bin
9fbe938f90be211b771c2d5d51015360b78f651dcea4786ae02899c0365775f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 11568 bytes

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