Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d65956daf79fc0…

MALICIOUS

PDF

75.9 KB Created: 2021-04-09 06:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e836aae1a71d8cd634126eb6f43ef2e4 SHA-1: 29c35898110449699d9b25456527fd5e40706bf6 SHA-256: e4d65956daf79fc02819579d301f345c0be6b526fb893a425f69a30de738e777
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one prominent link points to a suspicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to academic or informational 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+a+literature+review+for+dummies
    • https://cdn.sqhk.co/noruwotil/WrTbhfv/wiziregomububulubebason.pdf
    • https://cdn.sqhk.co/pepupiribojo/dgflbjc/best_fantasy_romance_books_on_kindle_unlimited.pdf
    • https://cdn.sqhk.co/nafadilinozo/idihzge/imageops_reverse_image_search.pdf
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_0a9fcc74b23f46ae9533608c00e2a6b5.pdf?index=true
    • https://s3.amazonaws.com/wifukedot/tasco_trail_camera_not_working.pdf
    • https://uploads.strikinglycdn.com/files/1301d35e-b164-43b8-86d9-68e04a9e6361/how_to_replace_a_kohler_kitchen_faucet.pdf
    • http://wasamatebupo.rf.gd/68092003793.pdf
    • https://s3.amazonaws.com/fizufapu/boro_chele_song_free.pdf
    • https://uploads.strikinglycdn.com/files/0431bbbf-1401-4f35-8d84-273efc69353f/97970444806.pdf
    • http://dufogatate.epizy.com/94359523308.pdf
    • https://s3.amazonaws.com/fovezewi/pre_b_ed_form_2019_rajasthan.pdf
    • https://uploads.strikinglycdn.com/files/d98ee648-2787-4370-8b7b-79df1dea84b4/fluval_406_spare_parts.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_f0adf9c29771469e8936f6b807967b80.pdf?index=true
    • https://s3.amazonaws.com/nafamaragisek/xojimunagijipegej.pdf
    • https://s3.amazonaws.com/numunenoji/atualizao_whatsapp_apk.pdf
    • https://s3.amazonaws.com/legipalofi/charlie_and_the_chocolate_factory_the_musical_full_show_2013.pdf
    • https://s3.amazonaws.com/zulezov/birid.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_off0000ea23.bin
c396fe837758ac69570ae2c1ecc9d01094f6a6945924b0f58dd5f8a7e9ea0c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 5312 bytes
font_01_sfnt_off0000fc23.bin
0938bff746430204e5cff66b3b1efc79900102121863ed3afad11e6527a4f24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 11172 bytes

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