Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b888c93d773bbc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-09 14:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 200334fe10945ccd1531eb9a0244f8a0 SHA-1: 957039ff42c6ea4dd3c35c97f794c503aac63c61 SHA-256: e7b888c93d773bbcb210cdcda34df0a3e6a95dfb4c58680af200e5a1904261c4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/wix?keyword=focus+group+guide PDF link annotation
    • http://tramlaweq.online/fiwonujaroxagusupiwuqtjsy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5fee2c8230cd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401518/normal_5ffeff6af19b0.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/25658057535.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/j21Ngix/230733480.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/87746719256.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/gj7qpig/wild_crocodile_sim_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fed6af111a64.pdfIn PDF document text
    • http://true-board1.club/vusalupaxigul12w58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_602b671c4e90c.pdfIn PDF document text
    • http://goldstein.berlin/mugen_rao_abinaya_song_masstamilangd4cy.pdfIn PDF document text
    • http://kinorio5.xyz/murejivotadalurgm809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_603b80d31b742.pdfIn PDF document text
    • http://nozetexopawovu.iblogger.org/wajadazosowukowizodaja.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/does_verizon_have_any_deals_right_now.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/ihjidge/nebofovaz.pdfIn PDF document text
    • http://instapriz24.site/buck_converter_circuit064u3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexejof.epizy.com/display_alert_message_android.pdfIn PDF document text
    • http://favigagiwu.epizy.com/zinedexezesemadezo.pdfIn PDF document text
    • http://xipixasalor.rf.gd/17464398358.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/lenovo_g50-80_drivers_for_windows_8.1_32_bit_free_download.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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 4956 bytes
SHA-256: d8aa27fbf13531a3327e2a195c014a85275a7ce1ad0a4e497f8077519b9b35ec
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 10672 bytes
SHA-256: 7786a8f1819bdfeb2d6ea05d8bbf4c6ab8259ef1ca5fa74b52a9abde8bb11b3b

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