Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5ce8efba565e77…

MALICIOUS

PDF

80.6 KB Created: 2021-04-15 23:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1683b6439c42d449d967cd95b6e07c21 SHA-1: 1b2fce819196b02f9ee2b1d595a7db25bf8f054d SHA-256: 4e5ce8efba565e778fe06c869324ec6b79dfe8f61de7b81453f3e1dec4e3f042
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=corporate+social+responsibility+jobs+nyc+salary PDF link annotation
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/7258033.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/rupimapotogizuros.pdfIn PDF document text
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/wevobizuma_nidunawukoba_xosikiwaben_lifoxemugumi.pdfIn PDF document text
    • http://all-host.site/pakikuxejevemonu9911.pdfIn PDF document text
    • http://getyourscore.info/schwinn_discover_hybrid_bike_walmart39dlv.pdfIn PDF document text
    • http://yourlivehelp.com/61843569987oegvs.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/teferixalex_sixebozadon_zupipisaxi_popexukinuledav.pdfIn PDF document text
    • http://petrol-v-pol-price.site/is_it_normal_for_oil_heaters_to_make_noisee72zp.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/mulolesi_poruti_wewugejasaxuwun_matanirutabub.pdfIn PDF document text
    • http://storeyou.store/broadcastify_police_scanner_apkkvbkk.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/24e51bcd38da.pdfIn PDF document text
    • http://trychambre.xyz/how_to_check_apple_manufacturing_date6bpfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nufeluzuxaluw.epizy.com/marathi_audition_script.pdfIn PDF document text
    • http://xogimutidum.epizy.com/vulupesejariwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56fe9f46-acbe-44d7-961c-0bfb220bd055/62092430989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce95e1f6-d29b-4936-9a93-705d5f220387/how_much_is_license_renewal_in_north_carolina.pdfIn PDF document text
    • http://jovawat.epizy.com/ruribetip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5056 bytes
SHA-256: 4aaba6c23fac98c8638963e4d07d7f568f799bf9679ea41c61e708323d322115
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10992 bytes
SHA-256: 19cfb08dc324926aac60dfc19aee6837a76063989cd792201ef3d5d25003993c
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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