Malicious PDF — malware analysis report

Static analysis result for SHA-256 8323efc1377fd8b3…

MALICIOUS

PDF

81.9 KB Created: 2021-01-27 01:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 735cbc237892cc0c24c85f8e06cde2f2 SHA-1: 84d61c59d7178b952b93c4e611ddd9769936cc09 SHA-256: 8323efc1377fd8b3831e3b4068932b93c397c521963a23d0e7b59ea05204543d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'Samsung j2 pure specs', suggesting a lure to attract clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/123?utm_term=samsung+j2+pure+specs PDF link annotation
    • http://c-advance.space/braverman_neurotransmitters1upzv.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/eShapic/talesibovogumobafeveso.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/iZzjjjf/pixuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5ff7b1e79a9ec.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hfnhbji/history_of_arthritis_icd_10.pdfIn PDF document text
    • http://pop-marketplace.ru/planet_of_the_apes_1968h5f6w.pdfIn PDF document text
    • http://lakshmi-store.ru/nufadipugogusuwvvbj2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5feeaaef73c2e.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/czpgcji/nakiwaneloxesafigumiwevi.pdfIn PDF document text
    • http://pepipejevu.iblogger.org/vobamosuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425933/normal_6007f38ce6cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/fhcgidh/dofezulilikekezaluguwawi.pdfIn PDF document text
    • http://picsonair.com/mutuladujekipimhww1p.pdfIn PDF document text
    • http://detonic-italia.website/high_art_vs_low_art9gg21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_60106c5560669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/free_invitation_templates_add_photo.pdfIn PDF document text
    • http://vininotubosom.epizy.com/new_telugu_album_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/84144981959.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/a_wrinkle_in_time_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/kuzonexitikemez.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5532 bytes
SHA-256: 397f7403b148f8b98d80aa6b9f897a2b49e72fe0b140887606602db7843b9a16
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 6096 bytes
SHA-256: 400d97edd7ebc843938de3cdab2b555a1328d60cd0154915083304386710c093
font_02_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 11168 bytes
SHA-256: 3d0bb11b8ff2110ce926e028cc99e7fe0749959608b8599d44cf9b153fa01353

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