Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d6b9360310963…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 22:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e564225c2a69714a0143b625beec135 SHA-1: d4d9da56430e4e9b5a4d028c61824e3eaab3ada9 SHA-256: ef9d6b936031096382b7304b06ba8181d597fa759b8aa0a39e183c47d9a2dcf3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, and is flagged by ClamAV as a phishing trojan. The document body, though partially corrupted, suggests a lure related to translation services, which is likely a pretext to direct users to malicious URLs. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=traductor+ingles+espa%25C3%25B1ol+audio+google
    • http://agent-spv.space/animal_planet_the_zoo_episode_guidetsbvs.pdf
    • http://punejew.mygamesonline.org/how_do_you_program_white_rodgers_thermostat.pdf
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/8f2db.pdf
    • http://coins24h.com/organizational_structure_in_healthcarexx54i.pdf
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/tarububomukofunon.pdf
    • http://fitokaps.xyz/44058506142fv0cv.pdf
    • http://igme.site/snapper_lawn_mowers_for_sale_useda57tj.pdf
    • https://cdn.sqhk.co/numavagoko/yP4hagh/xojolokutuzakisam.pdf
    • https://cdn.sqhk.co/nadipozow/hhBjeaB/figuginujesanufadaji.pdf
    • https://cdn.sqhk.co/lokutibu/hawV7ih/part_of_excel_sheet_is_grayed_out.pdf
    • http://smeshnoykir.space/daftar_obat_analgetikx76ju.pdf
    • http://jarevine.mywebcommunity.org/juzekekavubipomumiposal.pdf
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/e6182200.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_462715627b4b4b56b3131c26044db04a.pdf?index=true
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_ba3b2b40492242089f741b5ef82a76a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc1ba758-e2bb-4434-be94-94ab63189f9e/beowulf_seamus_heaney_amazon.pdf
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_43692e8e6dbe463788716f5a245624f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8a06ab4-0203-4d00-8aa6-d1257cbef51e/how_to_learn_english_grammar_step_by_step_quora.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f8847e90f76241299c6676e4e4f58885.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded8.bin
e7cdfdce4b437b86a8761b4b6425c5cfacdedbef627942ccfc9bd730010a0484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5400 bytes
font_01_sfnt_off0000f100.bin
c31d406874f8a77d0554a956aa0403231baf7480bc9482e196dc3ff338e63ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 5012 bytes
font_02_sfnt_off0000feac.bin
195035b20da2279bb0ddacf36a9e96cd453f56f23486bb7d6c9a295b57918d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 11408 bytes

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