Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee73be5ddae902e…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 18:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 126b0c72dabdc2018af4c9e9d2642f6e SHA-1: ef0fa830acec0ece4f92d159bc2425e16531dee8 SHA-256: eee73be5ddae902eaae648dac3567db9e2c42ab3dc3cddd87922c3078b2d7d47
156 Risk Score

Malware Insights

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

The PDF contains a lure related to job interviews, but the primary malicious activity identified is the PDF_SEO_LINK_FARM heuristic, indicating a large number of external links to other PDF files. This suggests a link farm or phishing operation. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious intent, likely related to spearphishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://leonvi.ru/123?utm_term=how+to+prepare+for+java+interview+for+5+years+experience PDF link annotation
    • http://skidki-day.store/milavizekasa6hww.pdfIn PDF document text
    • http://rodina38.ru/rivers_of_blood_lyricsn6b1h.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/nebefot.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/nateminadoxomirukimi.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/nofidaruk-tizorenu.pdfIn PDF document text
    • http://1gusevshop.space/244148124186zy18.pdfIn PDF document text
    • http://jopkapopka.online/67194158270igedu.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/jevukusofop_mokalusasix_jonefexele_rojufun.pdfIn PDF document text
    • http://info-pages.ru/pro_ad_hoc_server_ip_address_ppssppkczp7.pdfIn PDF document text
    • http://beststudent.space/387290119852fpga.pdfIn PDF document text
    • http://bodyita.space/vunitzb7w5.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/073b9b06be7cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vokeri/draft_horse_size_fly_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/19796607593.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/27942855951.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/xomujefixufevajawoguru.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/center_align_text_android.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/ms_project_2010_standard_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/payday_2_vr_improvements_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/english_worksheets_for_grade_2_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/rufelaluziped.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/black_semi_formal_jumpsuit.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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5460 bytes
SHA-256: a9d25e3a8be512bf2802ca41ff12d424aa5dc11af43e46ddf1ed60d545450ab7
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 10508 bytes
SHA-256: 7ee1a98385c10f08ee06ca9568a64a9d12f3183a32350b4d9eaae4f5856c0b4b

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