Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb6c357b8f0010a…

MALICIOUS

PDF

79.8 KB Created: 2021-05-16 02:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ade7b4ec0837ace49a969ceb6ce61507 SHA-1: 90cbfc8eb7019165a4de9a881f989f331fd9980b SHA-256: 6fb6c357b8f0010a24b642bf813194ec45e6bf1380af492edf1dc572ba7e0bf2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and associated with 'us army field artillery school', suggesting a phishing lure. The presence of embedded URLs and the nature of the detection indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://baarspo.ru/strik?utm_term=us+army+field+artillery+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5fdc5e77716f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_6006a73ac0585.pdfIn PDF document text
    • http://joblanc.xyz/hindi_to_english_speaking_app_downloadp2rjk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_600acb8dc6e90.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/mojanil.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/1932464.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/76ac5e74bf.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/6602a4ff07463.pdfIn PDF document text
    • http://usacreditreport.info/65562691827tlbg5.pdfIn PDF document text
    • https://fojugifobuko.weebly.com/uploads/1/3/5/3/135328464/8742318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fda118ecfa1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_5fda66a17f1d9.pdfIn PDF document text
    • http://bigmagazin.xyz/wudanojovarudidogobih6ril.pdfIn PDF document text
    • https://nugezufetewivu.weebly.com/uploads/1/3/4/5/134598593/fusabojiraz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6041af9fcc6be.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/vetum-vokuwagog-pofesefopuworu.pdfIn PDF document text
    • http://bridgecommerce.com/82506152693u87v9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fccac600d997.pdfIn PDF document text
    • https://sobixalotebi.weebly.com/uploads/1/3/4/0/134017917/turivomafonaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd2848d3b47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd4789eda7.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
    • https://s3.amazonaws.com/pibabopuduj/zenesafulujeva.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/the_women_of_brewster_place_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/thule_4_bike_rack_tow_hitch.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/metals_handbook_10th_edition_volume_1.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/30757179049.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5036 bytes
SHA-256: 28f84d3a2768be10bf5e5967fa25316628556e00c338e4992f13618df27ec800
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 10396 bytes
SHA-256: 2aacf70647b5b0bfa275fc23de1d87340970daf0f4d99b98d96aa37b966c4779
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3