Malicious PDF — malware analysis report

Static analysis result for SHA-256 564d3beb56b80c8d…

MALICIOUS

PDF

97.2 KB Created: 2021-03-27 23:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47f00bd7d0bb55589e02f61c8f487e7e SHA-1: e27645d036defe048de68453df121e6dd4cb9b79 SHA-256: 564d3beb56b80c8d89da61a0f978e7b9cd72fb64d4c6e0e876f183d54214898e
96 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-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://druttle.ru/123?utm_term=hot+rolled+steel+sheet+standard
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/tizenorilibijonigu.pdf
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/3407261.pdf
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/xiporutip-doriv.pdf
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/judemowijosin.pdf
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/6961320.pdf
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/netogofalegavefoz.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/majifa.pdf
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/2e0af429ee8c.pdf
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/xerigasikizifanusut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4b7da3f1-d6b3-4042-913a-0c390dbc9cdc/49440680946.pdf
    • https://s3.amazonaws.com/naxozelozude/lewosakojafagavaburi.pdf
    • https://uploads.strikinglycdn.com/files/2e1740a4-219a-436f-9628-1fb168bfc0c0/learn_english_with_tv_friends.pdf
    • https://uploads.strikinglycdn.com/files/2ca0b787-62f3-4f32-956e-ecd1d1977e09/where_is_e_on_ti_30x_iis.pdf
    • https://uploads.strikinglycdn.com/files/67188c55-ee92-4583-b714-74a58c414375/76366276229.pdf
    • https://s3.amazonaws.com/xilasisefi/51820868526.pdf
    • https://s3.amazonaws.com/tobojelusiwi/xaniveruluvozugodo.pdf
    • https://s3.amazonaws.com/sazariwapa/simple_verb_worksheets_for_kindergarten.pdf
    • https://s3.amazonaws.com/lopeteb/faith_s_song_sheet_music.pdf
    • https://s3.amazonaws.com/dezajok/identifying_parts_of_speech_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/c525a590-133d-42eb-ad37-8934d145e2f6/what_is_the_ideal_diet_to_lose_weight.pdf
    • https://s3.amazonaws.com/voropa/21402400113.pdf
    • https://s3.amazonaws.com/fomudebipefasu/84853170015.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130a1.bin
3226a02fe6f4aeb9991a38a85dca52079b377a10a9e7e709bd0f7877db30d543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 4612 bytes
font_01_sfnt_off00014035.bin
6da5e725c3ee9c587e10687a8946231131a47c260a846eaa9c03f7780b19ceba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14035 11640 bytes
font_02_sfnt_off0001677c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1677C 4324 bytes

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