Malicious PDF — malware analysis report

Static analysis result for SHA-256 871bc03d75b5944e…

MALICIOUS

PDF

77.6 KB Created: 2021-06-13 09:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36e7677181141bda6214020cc5d09ba6 SHA-1: e93335a44253ed4d2e646b08a414562844a1d80d SHA-256: 871bc03d75b5944ee783b6027815c7c220fb65c326412f4df0e805c8bca70018
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary external URI points to 'https://synerhu.ru/pbw?utm_term=lensa+pro+apk', indicating a potential phishing or malware distribution lure. ClamAV also detected this file as Pdf.Phishing.Trojan.

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://synerhu.ru/pbw?utm_term=lensa+pro+apk
    • https://cdn-cms.f-static.net/uploads/4476768/normal_602f0a1048e71.pdf
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/majonadifonobubula.pdf
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6024c7e49dc9d.pdf
    • https://jigerilo.weebly.com/uploads/1/3/4/7/134702464/guzodukavubu.pdf
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/f0a5a6758c86557.pdf
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60470e49607dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pilujibos.pbworks.com/w/file/fetch/145004421/rifotegizenurobimuvig.pdf
    • https://uploads.strikinglycdn.com/files/6775976f-4a7f-43ea-96a6-ea442041d009/93624426876.pdf
    • https://uploads.strikinglycdn.com/files/ede21a1e-98e2-4bcf-8805-c5885b1dbd96/how_to_get_velocity_graph_from_position_graph.pdf
    • http://jowukon.pbworks.com/w/file/fetch/145233447/tera_bhola_hai_bhandari_nandi_ki_sawari.pdf
    • http://raxonepem.pbworks.com/w/file/fetch/144755154/wedijerinik.pdf
    • https://uploads.strikinglycdn.com/files/da97bdaf-b076-494a-8ea5-aa19ded6da57/common_mistakes_in_spoken_english.pdf
    • http://mujusevo.pbworks.com/f/how_much_weight_can_a_cherry_picker_lift.pdf
    • http://rivikixizub.pbworks.com/f/zobowuvekipewupefegeru.pdf
    • http://pejokawigar.pbworks.com/f/find_a_celebrity_that_looks_like_me.pdf
    • https://uploads.strikinglycdn.com/files/c696fd1e-0e01-4306-8668-d84d98491cf1/does_microsoft_word_have_certificate_templates.pdf
    • https://uploads.strikinglycdn.com/files/482a0dda-ed55-4101-97f7-f28188a03d22/eight_domains_of_the_isc2_cissp_common_body_of_knowledge_cbk.pdf
    • http://ruzezotep.pbworks.com/f/vesamakajowovinado.pdf
    • https://uploads.strikinglycdn.com/files/1f43380f-49a0-4abf-b988-aebdfd2b9076/emergency_medicine_physician_jobs_new_mexico.pdf
    • https://uploads.strikinglycdn.com/files/f0d37f50-2a2f-4017-bfd9-0ed529522f33/68102418488.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df41.bin
df69abab6ee2eabbac925b26a23ed7817847ef0448f3e61ca0cd5f7b8b8419c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 4784 bytes
font_01_sfnt_off0000ef9e.bin
b45206f351b26fcee69e09546ee8c16d8a4a4e5bc46372e45c77f219727d56b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10544 bytes
font_02_sfnt_off000113e6.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 16312 bytes

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