Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ec9ebf2dc2f059…

MALICIOUS

PDF

75.6 KB Created: 2021-04-07 10:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389e6aa2d4bd4b5a2f6aa0bd85aaefaa SHA-1: 54d64faeaf708a3a1867102fac253fe988da0d84 SHA-256: d7ec9ebf2dc2f05959a4f77bf1858b5afaa2a876f28a6cc29e965f03dffcb706
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to drive traffic to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fokemale.ru/wix?keyword=labelling+a+galvanic+cell+worksheet
    • https://vawalebadafi.weebly.com/uploads/1/3/4/6/134660315/327378.pdf
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe50da0221e9.pdf
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5fedc8e42307d.pdf
    • https://cdn-cms.f-static.net/uploads/4464739/normal_604b0d703e7d7.pdf
    • http://wopudidadufi.22web.org/board_of_directors_definition.pdf
    • https://cdn-cms.f-static.net/uploads/4454182/normal_604fc2ba44d1b.pdf
    • https://cdn-cms.f-static.net/uploads/4426945/normal_60259ad392605.pdf
    • https://cdn.sqhk.co/lepowabog/gRjN4fv/suzitojarekazinake.pdf
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/dabese.pdf
    • https://cdn-cms.f-static.net/uploads/4467318/normal_6043909b50ae7.pdf
    • https://cdn.sqhk.co/zarepowake/cUjbLhf/math_1314_college_algebra_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5fe924c01a88f.pdf
    • https://cdn.sqhk.co/kimejijomaki/PHCkUif/bisexebedelenafezavejel.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fe9c8b719389.pdf
    • https://cdn.sqhk.co/zirigajer/sjj8HWZ/romakafepasikumikikenabo.pdf
    • https://cdn.sqhk.co/jimikafede/KjbrDbr/zombie_sniper_hunter_2_the_last_apocalypse_warrior.pdf
    • https://cdn-cms.f-static.net/uploads/4482002/normal_604334e1eae4b.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/novuwafat.pdf
    • https://cdn-cms.f-static.net/uploads/4479906/normal_603c756ceb2cf.pdf
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/6c59ce62297.pdf
    • https://cdn-cms.f-static.net/uploads/4418178/normal_6063549117af8.pdf
    • https://cdn-cms.f-static.net/uploads/4380213/normal_6046c57ccf75e.pdf
    • https://kogamawuxeg.weebly.com/uploads/1/3/4/5/134581879/4804398.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://takodibunogudas.epizy.com/oxford_advanced_learner_s_dictionary_kickass.pdf
    • http://rarezutawuwelam.epizy.com/international_migrant_stock_report_2019.pdf
    • http://zekutevig.rf.gd/where_was_the_island_of_dr_moreau_filmed.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_off0000e7e5.bin
935bc4b2bd2ad477979eebe70826f3565b1bbb470702df0a669e18918dab41ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 5356 bytes
font_01_sfnt_off0000fa36.bin
6936a5ab940635b8e0199ce186cab3a03f379de7975df1570ac3d417289f9534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 11212 bytes

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