Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5766d2fffba05a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-19 22:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ffe955b61959af601cd525b802c76c5 SHA-1: 9a882bcaf628b78747b7dcc39c158cd64ec5a5d1 SHA-256: cd5766d2fffba05a30670ba9e7eb1c2e9d061f0535ee333c10c23316e3f8fdc6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/123?utm_term=xseed+books+class+5+maths+answers PDF link annotation
    • http://durowan.sportsontheweb.net/anti_profiteering_under_gst.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fee663f89fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff8f5640f1e7.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/7657473.pdfIn PDF document text
    • https://tetizapafatig.weebly.com/uploads/1/3/4/6/134634663/regojusipakekax_rofoner.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/xavamuxopap-dududinomul-tufawovumawimik-zisot.pdfIn PDF document text
    • https://sozejaras.weebly.com/uploads/1/3/2/6/132695734/jitosubesupiw_bepirixomobowir_migiwakikimas_kigamiro.pdfIn PDF document text
    • https://milolavum.weebly.com/uploads/1/3/4/7/134717842/jelorez.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/how_to_draw_a_simple_realistic_dog.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/1871293.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/95698618488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_602783ed3ac29.pdfIn PDF document text
    • https://bivorafonesakal.weebly.com/uploads/1/3/6/0/136021739/kufumapibalewiba.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/xofatopukali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_600592e4e0c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_6040dcd65c6e0.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/zobajadika.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/92321605273.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/36297845911.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/32524060732.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/cuanto_cemento_tiene_un_metro_cubico_de_hormigon.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/51364098391.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/rikosevuzulidamiz.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/you_deserve_it_song_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 2916 bytes
SHA-256: a0949fd7a138d606fe2e30ae29724678f80fbe2b24360c383e0dd299f1bbdec4
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5576 bytes
SHA-256: 8672e156a80a685e7a9bfecbc7101ad2f5ce96ebdb86c367b41d28f3eed2616a
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 10528 bytes
SHA-256: 16b0d1c5f9c66a71e9e44645500a3d7749ce56466460e5a7290c322ec3648817

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