Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd31817e20a70e25…

MALICIOUS

PDF

76.3 KB Created: 2021-05-31 16:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81c4e34efdc11ee87a29bfdf87e8836d SHA-1: e3cf4e2552b7cdef029ca16acdd2b2ff2e12b9db SHA-256: cd31817e20a70e25a7373bb82f0b576bc8e1cfd9f5005613c0882c5018ce96ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure, likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/pbw?utm_term=how+to+set+up+cosco+pack+n+play
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fe8bd6c9a309.pdf
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/9278555.pdf
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/b6dcf12f.pdf
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6052a951298c1.pdf
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/8991311.pdf
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe9e2c7292dc.pdf
    • https://xekezasutix.weebly.com/uploads/1/3/4/5/134597126/9264344.pdf
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/lisej_sonapo_dowowutenulu_wotazig.pdf
    • https://cdn-cms.f-static.net/uploads/4484358/normal_5fd7dea2589d8.pdf
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6036e195894e6.pdf
    • https://vopixovusaf.weebly.com/uploads/1/3/4/8/134883771/e0306ea.pdf
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/bff89006bef8.pdf
    • https://cdn-cms.f-static.net/uploads/4470040/normal_605a0c1945648.pdf
    • https://cdn-cms.f-static.net/uploads/4476750/normal_603b7c1e8951c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a39a662-8912-4742-9a3a-1eb61dcb9c81/ginuwejesegeg.pdf
    • https://uploads.strikinglycdn.com/files/ce207107-ea43-4c25-9fd3-07e89507bd48/ritetemp_thermostat_6025_manual.pdf
    • https://uploads.strikinglycdn.com/files/fd3b158b-b6ce-4b05-8fc0-1d970ae3c0ff/jomivajukejosos.pdf
    • https://uploads.strikinglycdn.com/files/4576ef47-d30d-4b49-bc60-7399ddf5d1c6/kousalya_supraja_rama_purva_mp3_song_free_download.pdf
    • https://uploads.strikinglycdn.com/files/95347c25-cf34-4031-9646-1632b5d8946e/old_skool_vans_blue_suede.pdf
    • https://uploads.strikinglycdn.com/files/f7dc877d-3bc8-4028-84c5-99731ea3f10d/life_fitness_x5i_elliptical_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/2d8539ee-707e-4047-9e01-b4572c9859f9/apache_camel_in_action_2nd_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/71b0a33c-0ffd-438c-a4a0-f88d9f6eafa3/golds_gym_450_treadmill_manual.pdf
    • https://uploads.strikinglycdn.com/files/5cc35b01-34e4-4ada-8a83-7fb5eb69c20a/what_does_jade_jewelry_mean.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_off0000eec1.bin
05a17d79ea5407631e284c773c4ae3faea4bf3b2d748f9f2fe074b76611e5ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 5052 bytes
font_01_sfnt_off0001001f.bin
23e3a6a58754687730c48e5145f0b7f8a806b8d42a8418ab577dcc3396a6b78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10400 bytes

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