Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32dac06e20b8b88…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 17:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b016d658f7b768457cdc6ad1b681b87 SHA-1: 7a21644bb598ea893e4096e49110e6f3ef87cf15 SHA-256: a32dac06e20b8b885bae542dc70bbe25076aad7eb5300bf1fa5450e1b3229066
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external links, indicating a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest it is designed to redirect users to potentially harmful websites.

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://mezovuduw.ru/aws?utm_term=the+allyn+and+bacon+guide+to+writing+5th+edition
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/somurixezewe-vorobo-kasanepopujeno-sapilamusowaz.pdf
    • http://rafonuza.22web.org/nilegunatox.pdf
    • http://bravos-kids.ru/what_is_the_use_of_web_servicesgfxa2.pdf
    • http://parkji5x.xyz/norse_mythology_loki_daughterh62h8.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/sojefe-gurenuti-rijikoveperuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zukegavodobuxas.epizy.com/affaire_de_coeur_danielle_steel.pdf
    • http://wuburujezajewix.epizy.com/twas_the_night_before_christmas_read_aloud_online.pdf
    • http://kigetivizaru.epizy.com/autoid_network_navigator_sr-_h6w.pdf
    • https://uploads.strikinglycdn.com/files/2e95bc26-c8ae-422f-b7e4-98f526bc2ceb/what_is_a_four_line_stanza_in_poetry_called.pdf
    • http://bikumekomem.epizy.com/xejojevumaw.pdf
    • https://uploads.strikinglycdn.com/files/6ca73e89-44e1-4b5d-b4ff-a657bcaa658d/18731911427.pdf
    • https://uploads.strikinglycdn.com/files/7e912820-5185-4237-87b9-db802f685372/tidoxosigok.pdf
    • https://uploads.strikinglycdn.com/files/89ca7c1d-b4a7-4546-acec-fbc9c049313c/23438249095.pdf
    • http://nirozat.rf.gd/bet365_mobile_app_free.pdf
    • http://gabozimipuz.epizy.com/o_que_e_uniforme_em_ingls.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_off0000fcf6.bin
cfcf5faae1f7c0c41e6b0585806b6b19590918de56a3049c1fa80525d0ee2288
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 5428 bytes
font_01_sfnt_off00010f81.bin
721aa81e4dffd23cd7fa42ce21eb9e23c9c17987708c4dd8c1d9d7c8ab35def3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 11464 bytes