Malicious PDF — malware analysis report

Static analysis result for SHA-256 117f611eaddc7e90…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 19:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73c472561bc72488dc4028236521dafd SHA-1: b1aab1b0e9d5ea51cd2534647b0bdef5ed177a66 SHA-256: 117f611eaddc7e904304694b12c369eb3565e7c3131481d3aa0fd6962cc84cbc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=hospital+and+clinical+pharmacy+by+pratibha+nand+pdf
    • http://zexawil.22web.org/fepabu.pdf
    • https://cdn-cms.f-static.net/uploads/4413239/normal_604994b7dd9d7.pdf
    • http://tinuliv.22web.org/classroom_application.pdf
    • https://static.s123-cdn-static.com/uploads/4384472/normal_60035ed07f7d1.pdf
    • https://cdn-cms.f-static.net/uploads/4374838/normal_603cb59d3952f.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6048a0cb7d4d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_972b88ff55524e66bd8c86c2349c93e7.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9c61b87f92e54ca68980f3235261c0b1.pdf?index=true
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f0cdc7e58c524c9788dc6a5ab9827115.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3385dadf-be3c-4e07-919f-69b8840ca90c/xaporu.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_56b558193e5e42b9a91e4b4ddec94f02.pdf?index=true
    • http://nakosaf.rf.gd/mikejipezogu.pdf
    • http://wivovazu.epizy.com/31400120496.pdf
    • http://pikotesewelum.epizy.com/pegawenitutisek.pdf
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_09f25633b58247aa835df889affc58f2.pdf?index=true
    • http://tikikenuf.epizy.com/13937595751.pdf
    • http://nakitelas.epizy.com/first_alert_wireless_smoke_and_carbon_monoxide_alarm_manual.pdf
    • https://uploads.strikinglycdn.com/files/e7dd99f4-abf9-41da-aaef-782cb7117eeb/lorex_eco_stratus_app_not_in_play_store.pdf
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_51405ea4d2344a4597a2fb3982d43bd6.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_da2aa577006a4e1aba90070c89dd1895.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e63602b-0c89-413b-af83-ff7af1790eff/84400068597.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c964e0d2859e41ee8fbd3abc9af3684a.pdf?index=true
    • 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_off0000d37e.bin
2b82d53492b73291936807356c11d3fcf9f4fd8b5633793bd33e358484a1445d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 5600 bytes
font_01_sfnt_off0000e65d.bin
2f10a06bdff82e2457188fe3ce8cd4d8280432d126b409b158aaa4b0c558c19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10512 bytes
font_02_sfnt_off00010a6c.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 16164 bytes

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