Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd9f020e57aa28…

MALICIOUS

PDF

70.6 KB Created: 2021-02-18 21:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80654f4d0ab91ce722ea97e6939599df SHA-1: ef37ffb99d61ce5a2fe0913d1cfda7b31b866253 SHA-256: 82fd9f020e57aa284eb65e80af2edcb3ee3aa60a3c581d1f15f54b68a6c908d6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector disguised as a job search query. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Google cloud security engineer jobs', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=google+cloud+security+engineer+jobs In PDF document text
    • http://tolumibawaka.iblogger.org/energia_elica_como_funciona.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/dhihigd/difoseruzuxomegovif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5ff67710ba617.pdfIn PDF document text
    • http://bonifacy.site/finding_hypotenuse_of_a_right_triangle_worksheeth4n21.pdfIn PDF document text
    • http://boevoenlp.com/329939206206dlex.pdfIn PDF document text
    • http://getallcreditscores.info/andrea_bocelli_amore_albumfch7j.pdfIn PDF document text
    • http://ins.expert/acordes_para_bajo_electrico_de_5_cuerdas404a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_5fe7bf1328635.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/ibl8L5E/tiles_hop_forever_dancing_ball_android_1.pdfIn PDF document text
    • http://derewopenila.22web.org/fojuduwakozebikiva.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/iLjgVgj/negin_mirsalehi_husband.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejojofumitob.rf.gd/jejizoropew.pdfIn PDF document text
    • http://ziboporo.epizy.com/demand_letter_to_contractor_florida.pdfIn PDF document text
    • http://kileduf.epizy.com/daybreak_netflix_parents_guide.pdfIn PDF document text
    • http://gurimufibefuw.rf.gd/57565871317.pdfIn PDF document text
    • http://wisunomimat.epizy.com/39196727613.pdfIn PDF document text
    • http://tuwafexom.epizy.com/vaaste_song_cast_ringtone.pdfIn PDF document text
    • http://bolupare.rf.gd/vabibutanuligevu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 5244 bytes
SHA-256: 3a0dbc217b04251438e142be38c0366d6b3f0fe0c2d47020cc8d3e620869b99b
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 11552 bytes
SHA-256: 4c492a233762892d181fcab3733154a3744b67f9ed4336bbf3039b389a66e3c7

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