Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f6e2437be43c9b…

MALICIOUS

PDF

93.8 KB Created: 2021-03-28 13:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb445b782a58a1e4dc0372b0f8d5ef88 SHA-1: bf94bea6acbfdccfa1102d51305027a62ce57753 SHA-256: 28f6e2437be43c9b5637dfae932f4c63ea96d1a0ae1ce0f5900ff35550b53005
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting it functions as a link farm to distribute malicious content or phish users. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=c+programming+bangla+book+pdf+free+download, which is likely used to redirect users to further malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=c+programming+bangla+book+pdf+free+download
    • https://static.s123-cdn-static.com/uploads/4401976/normal_60067f62e6e29.pdf
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/fizita.pdf
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fff7d67cc39a.pdf
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ffded4d2effb.pdf
    • http://forovasax.medianewsonline.com/sgfi_calendar_2020_19.pdf
    • http://pipavinekiga.mywebcommunity.org/mibuvumagitol.pdf
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/1226310.pdf
    • http://foxilajat.sportsontheweb.net/black_sabbath_paranoid_lyrics.pdf
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/fekenurada.pdf
    • https://static.s123-cdn-static.com/uploads/4488806/normal_5ffb5be6e18c8.pdf
    • https://sefufexuga.weebly.com/uploads/1/3/4/8/134884271/3211b953cfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/tarajix/scrabble_word_finder_dictionary_free.pdf
    • https://uploads.strikinglycdn.com/files/5a32d382-00ed-4be0-b34b-ed4f62013785/mugovenafu.pdf
    • https://s3.amazonaws.com/kiwopusafize/invoice_template_for_mac_pages.pdf
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_7e06b8a3fa24450084d464e3ceac8d6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/68574558-bc1d-4965-a1d2-2d16ef69071c/linosogidutevavizaj.pdf
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_20f11ab6ade44dc6b73c76e61b5f2bee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ece14ae4-e1d8-40ac-8748-b86d3693cf7b/24325931118.pdf
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_0c230cc022784c88b4c2b363fc2c6f4b.pdf?index=true
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_b63f0fe17b42424e95dee6d3341d57d4.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_d111edc684144a019ad1e9d25de7831b.pdf?index=true
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ad.bin
1515b318d68d769379860cd110676708cc29c544f1acee912c8136a398330879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 5384 bytes
font_01_sfnt_off000108f1.bin
3e660847fe297be444fef3247f3613e3c6febef2995d3f2d6630ee3de59bd4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 2752 bytes
font_02_sfnt_off0001148a.bin
d51f99d35cf383041cba510b6a2a299b3c4e337ad227bae138a4c075dff2b019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 6076 bytes
font_03_sfnt_off000127f7.bin
2c1a83c18799687b251c03ab6d96c25a5e12c1921fba92d4e91992b14d16c746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 11544 bytes
font_04_sfnt_off00014fa6.bin
ab7733a3925005917c541a94fe7a302a024c9a2a023cdb629dd48802bed5219e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 16520 bytes

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