Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ac4a502814f2d…

MALICIOUS

PDF

67.6 KB Created: 2021-03-07 02:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 20d854adaa720e77774486991c229de7 SHA-1: 1bb49352881a2469aa36a030725a9d4b2169c1bf SHA-256: bc7ac4a502814f2db3db5691ea4961d3340af13b1a9157b6c41309ef5606b011
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or scam campaign designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://kuzutuzo.ru/wb?keyword=kindle%203%20cover%20with%20built%20in%20light PDF link annotation
    • https://dijozigi.weebly.com/uploads/1/3/4/7/134748041/sagotonele.pdfIn PDF document text
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/tunufivesaji_xifogejevopa_pavirunebovi_legunikefimiweb.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/lorug.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/what_amendment_was_violated_in_brown_v._board_of_education.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_much_to_make_an_indoor_soccer_field.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/sony_sa-ct780_sound_bar.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/tewogurovusuverasa.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/can_i_print_a_fedex_shipping_label.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/c8f87e995df1.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/72066450490.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/danby_ac_accessories.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/4486964.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/turidenoretaton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukokovevaz.atwebpages.com/how_many_calories_in_a_krispy_kreme_chocolate_donut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a66e9d-9786-43f3-8065-77baa1e6f1ed/muxefilizorazapefunorog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902e8fd4-8018-484e-8d69-a4d2872e581e/bawufuxidif.pdfIn PDF document text
    • http://dopovis.myartsonline.com/current_issues_in_environmental_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa5b688-d305-471b-ba09-1a422517fc69/20769297332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34565a9-3828-4e0f-b700-2f7cb9d85060/what_type_of_oil_for_gy6_150cc.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/psalm_23_4-6_kjv.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/voxeguret.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/the_things_they_carried_chapter_1-5_summary.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/41918411802.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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 5240 bytes
SHA-256: 14f904dc3b71105ac4857f033a17702f8cc659263118498d04369e6f55a24a86
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10424 bytes
SHA-256: a6a2111397073adb789526a143b31a984e6b50164db9f5583a31825cb121d0e8