Malicious PDF — malware analysis report

Static analysis result for SHA-256 438891de44d67382…

MALICIOUS

PDF

74.8 KB Created: 2021-05-22 00:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a20beb557dabbeb663a88d1a435c774 SHA-1: 12fc2a92a4e780b267ab0d30afa3bdbe31310314 SHA-256: 438891de44d673821d311e36ad9ba87b8384bc85ae41d1e4739493b61e202ea2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or phishing pages.

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://vilenefex.ru/wb?keyword=best%20online%20english%20grammar%20classes
    • https://bupizezar.weebly.com/uploads/1/3/4/8/134853483/kizafimene.pdf
    • https://cdn-cms.f-static.net/uploads/4418777/normal_60194826e7f0f.pdf
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/9122664.pdf
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/melabewopivobawe.pdf
    • https://cdn-cms.f-static.net/uploads/4476268/normal_60616f9a28229.pdf
    • https://cdn-cms.f-static.net/uploads/4368976/normal_600d7eefc7709.pdf
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/fuwefujuwujep-sagosi-ruwoneb-pigekasogufigix.pdf
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/zusekiretilotap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dumupa/dumeset.pdf
    • https://s3.amazonaws.com/netinuwa/22785903561.pdf
    • https://uploads.strikinglycdn.com/files/dbee216b-3cbf-4b28-8dc7-fa950e2cb670/38563463014.pdf
    • https://s3.amazonaws.com/gelawiweza/xodixoxebomoriti.pdf
    • https://uploads.strikinglycdn.com/files/3e322a25-bab3-41c0-a7e7-55b779b5c126/686873271.pdf
    • https://s3.amazonaws.com/batoragubukepo/dokafasutixekodituvo.pdf
    • https://s3.amazonaws.com/paxivogedewilu/puzzle_games_java.pdf
    • https://s3.amazonaws.com/kakekojezutok/vigiwaragawa.pdf
    • https://uploads.strikinglycdn.com/files/c962dca2-be1a-4802-9c0d-58ff7830b716/kenmore_coldspot_freezer_light_bulb.pdf
    • https://uploads.strikinglycdn.com/files/7b1e09c4-49ec-482f-8f4d-26f270ac5099/black_boys_on_mopeds_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/c97bc296-08ee-4a7c-bff9-37429042102d/toms_coons_mulattoes_mammies_and_bucks_5th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d2.bin
0294f65fc8894409492a4b1b4501879c2a1703a40f62758aecc0423a29e8eb10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 5052 bytes
font_01_sfnt_off0000eac4.bin
094d1fb824b705f2e1ea549ca6cfe55509d4996b2bba2f20c414d2cbd7958584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 10952 bytes
font_02_sfnt_off00010ff9.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 4324 bytes

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