Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d41e1889efc811b…

MALICIOUS

PDF

79.9 KB Created: 2021-04-23 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ab995616a17c05910f941ddabc2184 SHA-1: 5fd1ef6ffe04ccc7a96b62d75ad37c2bf8a73b94 SHA-256: 1d41e1889efc811bda6c86073d28edcad62cecbc618d5f714d512263c62bc7ea
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, directing users to various PDF documents and a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=interpreting+human+pedigree+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4419847/normal_601f1d56c3bab.pdf
    • https://static.s123-cdn-static.com/uploads/4382209/normal_5febd4611de49.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_601107e363de0.pdf
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff46d2baf19b.pdf
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/jurofozezolajelada.pdf
    • https://cdn-cms.f-static.net/uploads/4487903/normal_60277605f09e4.pdf
    • https://suretazusidik.weebly.com/uploads/1/3/4/0/134012564/b04599b43cd4e58.pdf
    • https://pevetuximamit.weebly.com/uploads/1/3/1/6/131606263/kivurikisutaj.pdf
    • https://cdn-cms.f-static.net/uploads/4460042/normal_601e09e90ffcb.pdf
    • https://xevomixu.weebly.com/uploads/1/3/0/7/130776485/wavadujijoku.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/5026678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_0b613bb5e58b4aac9d1be6eecc06ef57.pdf?index=true
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_edd91e92096a4a6f99d29b526c2e5b4d.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_ceb756c9e6064d01a5b77c4ba429a230.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_ffa66c5032c347b9aea4e67883067fdb.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f987ea22970e47fc8292dc634ff5c4d9.pdf?index=true
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_12d9e70b55d84de9a8668c320843de3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2476037b-f222-48ef-83e0-a3f855cb6ac1/which_soundpeats_are_the_best.pdf
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_334ae50e9fc347968bdb8fa66be02d3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae00cf80-3fe6-43a7-a994-d4cb48179c3e/programming_and_automating_cisco_networks_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fd3210a2-80d4-4ec8-bf54-c37e209fb2a1/left_bank_lean_code_chevy_silverado.pdf
    • https://uploads.strikinglycdn.com/files/21289d3b-a472-485f-8b9a-1800393dcf64/what_are_the_types_of_sedimentary_structures.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_off0000fb36.bin
759d6898549c287f666b83a429886bf400a525feb6fc7a50089183039f396346		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 5436 bytes
font_01_sfnt_off00010d95.bin
01617c128fec420b321dec91fe12ffd0de541ac63d2fdf037701dca5866c2671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 10696 bytes

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