Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4854dc8fec555a0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-16 02:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e71c4e3b77c425a9c076944cf8405001 SHA-1: 77bccefedaac876cb0e3159a78dd90f60211644e SHA-256: c4854dc8fec555a0d3b6788274bd946ad0b90f3a90d9f9f733cca834c34af36e
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=fedex+bridgeport+wv PDF link annotation
    • http://btsworld.org/how_to_get_free_stuff_from_timeshare_presentationsc2v97.pdfIn PDF document text
    • http://c-advance.space/sorimumatosemexhnej0.pdfIn PDF document text
    • http://medicinfo.online/47711406389kgnkn.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/giigiQt/pixel_grand_battle_3d_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/kshiifK/lucky_draw_cod_mobile_garena.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/nejonajaluguxewas.pdfIn PDF document text
    • https://pekatizofu.weebly.com/uploads/1/3/0/7/130739174/db74bb5695c3dd.pdfIn PDF document text
    • http://thehensleys.org/fojevepolijedizuvujmohr3.pdfIn PDF document text
    • http://nashremont.site/3329388619184mab.pdfIn PDF document text
    • http://cashbackk.site/91352688036389bx.pdfIn PDF document text
    • http://conicppjry.bid/87561196019f8b9n.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/jCGyibj/mitizidixaja.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://uploads.strikinglycdn.com/files/28baa8a2-f450-4225-b0e5-2ce108fc16a0/495441128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d596a46-0c7f-4477-a083-7c713467ad7c/how_to_get_extra_credits_for_university_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/85020475922.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/82269298142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507e0be7-d296-40bf-9fd6-cd127344e5cb/baofeng_uv-5r_iii_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c845ac25-a316-4471-82cd-6876e7e4ca46/ashton_woods_apartments_greer_sc.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011640.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11640 18672 bytes
SHA-256: 9f366905b1c16a5c2c5877537f785fbb73475fc2ed960d67faae8f184b01eea9
font_00_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 4704 bytes
SHA-256: b7765105dab90fd2f0ffc879c29839e97a3f3f90c43ba72e61d9c90f50aedaed
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 10824 bytes
SHA-256: 03997fc98695ddcef6e3c264569eeba1d283e05d50908f6956e1ee05e841c2d6
font_03_sfnt_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378