Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeda555ea802e8f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-14 00:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d4c4e218cb4dc3d2211738042e8f4d56 SHA-1: 481ad3fa066679c4b038f818c2d9317cf296041a SHA-256: cbeda555ea802e8fa23d194cf5d6f0f5d538df9e5f9dc7b2ea53643ae1a17602
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a website that appears to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified the file as malicious, specifically flagging it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://wastran.ru/pbw?utm_term=how+do+you+lock+a+pdf+from+editing PDF link annotation
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/lugujaban-fapibaruj.pdfIn PDF document text
    • https://nisolelajuzo.weebly.com/uploads/1/3/5/3/135319935/tuzotetit-kujujijekugu-wopej-sovesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aa3d43fa-4b92-4245-a99c-9ee48e99f694/2002_ford_focus_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e3923-3ddd-4609-9ed1-6c56dc151d15/korojuzubofuxeriwijar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b4d5bc-b3d1-4d0c-adba-22f6699aec5c/sanyo_rice_cooker_set_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77604f8-553e-4f89-8305-45d526ceb918/bibepovibavasidopegamuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a127969b-e465-4205-8c8f-2149e3d734e5/49189083096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74882bb-386a-446f-9b58-de3678f630b5/personajes_del_libro_los_hermanos_karamazov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fbb933-6cd6-4b1d-a964-deea9b9f16ea/31284029926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1344f0-b9d6-4af2-a05c-7a4487cdb69e/java_game_programming_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44dc7b9e-b116-423d-b618-dc84dd663a80/rowusisatarukuvakarazebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfcba6e-dbde-429b-af66-a77b0580fd7a/62598342609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015ee269-2a29-4e35-8b6b-d89c7750a96b/wofuwikapofubovowowepiwun.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/145136646/lotovafenomidoziwi.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/12721459247.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/145091748/baptism_of_fire.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/nescafe_dolce_gusto_manual_vs_automatic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16090f75-3100-4782-9bde-d955b0606ab3/65368116631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737aae1d-eac6-4e8f-8750-8ddecbb5f109/how_to_disassemble_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb06bbbd-1f13-415f-8065-4e04a8e0893a/29760606593.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5396 bytes
SHA-256: 34c70bf206448ff201643a87a9e0a85f64958f869da48b8e424e37cdb4196456
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 10592 bytes
SHA-256: c1b856b2f95e16a5c8754b339f1d73de1cc67b5225c4db4c6857a0f0cb96d398
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333