Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14db9582c89f7d5…

MALICIOUS

PDF

80.8 KB Created: 2021-03-16 12:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6235e884d053142278095b4abee17089 SHA-1: d71e6fe5360fe24f9d5e56cb02b108159daa786b SHA-256: f14db9582c89f7d5cd19554743f17feab69d52d51744de548d005c3fe154ebf8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pattern suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://bologen.ru/award?keyword=hey+soul+sister+piano+sheet+pdf
    • http://nanolenka.xyz/sudegth11y.pdf
    • http://jusukigib.sportsontheweb.net/63022952017.pdf
    • http://naxajogilelog.medianewsonline.com/sefosimipepozopivebazagu.pdf
    • http://theharaka.online/37662129174cfmmn.pdf
    • http://qqkaxes.xyz/niv_study_bible_large_print_leathersoft_teal_red_letter_editionkp40c.pdf
    • http://fajasated.mywebcommunity.org/73778037690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pipaneku/27851275829.pdf
    • https://s3.amazonaws.com/suxuzubojut/whatsapp_status_video_saver.pdf
    • https://s3.amazonaws.com/bupijila/62797020686.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_7507e4363f174616b9a87b88d47b4a10.pdf?index=true
    • https://s3.amazonaws.com/gitipelut/voxavujepazonoxapolarotig.pdf
    • https://s3.amazonaws.com/bezegoluzose/nelikoxepejumugajedinukip.pdf
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_96fffc72b8544bc695948efc4c907f34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f7b4171-e8dd-4041-b87e-1a98924f36a7/84606334637.pdf
    • https://s3.amazonaws.com/zafijukopa/citation_for_bates_guide_to_physical_exam.pdf
    • https://uploads.strikinglycdn.com/files/df2ad669-834a-47d4-adc1-b5d6bd23d660/difference_between_viral_and_bacterial_pneumonia.pdf
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_909a6e2a6cdc4f86b5f4b736213f8ec5.pdf?index=true
    • https://s3.amazonaws.com/bipepezuwed/blame_it_on_the_boogie_sheet_music.pdf
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_bada38f3e6854128a73dbfed73c75ccf.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/introduction_to_mathematics_book.pdf
    • https://s3.amazonaws.com/tezofuretejom/diy_fly_fishing_rod_holder.pdf
    • https://s3.amazonaws.com/dakebesuvum/risk_bubble_chart_template.pdf
    • https://uploads.strikinglycdn.com/files/1cfd0873-7258-455b-a2f7-c67a92aa1a4d/dejitunozatiwefagu.pdf
    • https://uploads.strikinglycdn.com/files/5e8affc0-8578-46b8-82e0-e5b3e24bff7e/wimividodefaja.pdf
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_34af895065e246aa816f9bdfaf372cf3.pdf?index=true
    • http://jirabasojexosud.atwebpages.com/body_parts_kindergarten_worksheet.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_off0000fc96.bin
ecaab847e362c16a7e16d6cb5a3996f284a936dfe139ce05f653f810945595fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 5192 bytes
font_01_sfnt_off00010e3f.bin
29d878984b117bec60798b8538b29ab2c47f615ddcb5e46c9b2cd05b98e63042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 11796 bytes

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