Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37b0ca82d2259cf…

MALICIOUS

PDF

71.2 KB Created: 2021-04-05 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31e38377cba7a9d6b521e3253e4c76ae SHA-1: 562ca1be8fb83f1abffc48493c66288127ffb820 SHA-256: b37b0ca82d2259cf48aa25fb0f470b7cb627bc408be052458b99b19cd09f8cff
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wix?keyword=becoming+familiar+with+lab+equipment+worksheet+answer+key PDF link annotation
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/f96fc.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/pavetugowi-zimitodomalit-pitonupoponuze-mujinajamido.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/750241.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/dosixujusezeg.pdfIn PDF document text
    • http://zebolalifitu.22web.org/ninubezuxisasuzekodaguje.pdfIn PDF document text
    • http://wufebowukavij.iblogger.org/bacterias_gram_positivas_y_gram_negativas_ejemplos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_8223c7d858ba4a4ea2bc7c903c498d9f.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_ec5b470ce9e3414db4d7f773c7103c74.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_20591cff058a48169b0c1e070830c38e.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_09dcbc09a577492e9a5df75650ff2cbd.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_ac0d94839c184ea1a336db29f13cd05d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96322606-8d1a-42fe-97a5-3e7d73435df9/diary_of_a_wimpy_kid_full_movie_free_rodrick_rules.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_f242e8b6b379490d88338bb69cac019f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f323bf2-2ff5-4f01-b291-373df82cd9c8/60810069647.pdfIn PDF document text
    • http://numapezo.rf.gd/34840607798.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_25bb784da3a049c6827713113d75a0a2.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_1f07f709783b4481a539768303bd8550.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_7a61811857f2425abb7f39435f8b3e76.pdf?index=trueIn PDF document text
    • http://tejozusob.rf.gd/acacia_catechu_medicinal_uses.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_e707d3b6a9bb4d3387a5b33b773c65b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/105be9e3-a430-4769-b5a1-6580d5ee4250/taritoregajujezit.pdfIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_89c2119489ce4b59852f9d1dc6b866f1.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_a0f985b560784756b1efd336e211dcb3.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 6000 bytes
SHA-256: 5bca4e18a1c6ad0472db280813b20b6da58c9844a126c97524776abae02a814d
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 10068 bytes
SHA-256: 648dd20acdf9490a39a3f5bf85c0597fc6fff289893031649517fd8f69768228