Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f82caee6a186e9…

MALICIOUS

PDF

77.8 KB Created: 2021-05-07 20:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac5efaf03c3baeb7cbd58a1aa83a46d8 SHA-1: 3d5cdadd52868b9bb2dc15ab88b398501c2a7a03 SHA-256: 49f82caee6a186e9b67488a51362bc59131346ad049fb24cf1c0b3656ed517a7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with a critical heuristic firing for a PDF link farm, suggesting a phishing or SEO spam campaign. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=casio+g-shock+gold+black+ga-110gb-1a', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=casio+g-shock+gold+black+ga-110gb-1a PDF link annotation
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • http://lipenav.mypressonline.com/9136838092.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/vupuwebavudu.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/wunupalezozerud/charging_cable_not_working_android.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_7918eab61eef40daa569cb2006b2d84a.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_8ad66a5a3be449a686b9fe5ace60ffee.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_e59c772975aa452c87c0cd3553b971bb.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_e2a9a4a89a8d4a1a99b84ff427925524.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_fe2ae21a46f04d79a880650d4523514c.pdf?index=trueIn PDF document text
    • http://pubodetag.rf.gd/degufibenagebaja.pdfIn PDF document text
    • http://dipimov.epizy.com/how_to_play_fire_and_ice_sorry.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_ac4cf83b5a7c4cb98d6878ddd3f72f35.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_b009cfd2dc564b7dbdf63895dee24fb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/is_a_carrera_bike_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/vuluzikuvizodolefanir.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/what_does_this_emoji_mean__from_a_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/ac_20-_130a.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/cleo_cheat_gta_vice_city_android.pdfIn PDF document text
    • http://fekajot.rf.gd/68375206321.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/74422599742.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_3004a844f52544e08c471b900015d25e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5440 bytes
SHA-256: c3eb7147d1203f709529fe47f9f877ae778929cc5e3b7b3398dad5c89a808cfe
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 12748 bytes
SHA-256: 0ee03fd65f99363938c8cb321bbb37bc45153e237aa3ec7e83322a6109ba826b
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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