Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ca677d8414e529…

MALICIOUS

PDF

78.3 KB Created: 2021-03-10 21:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b832ff51b6fc5ea29829986a5aea7654 SHA-1: 5d001589a98f9affde42d61edb4fc0b8bbac6c9e SHA-256: c3ca677d8414e5299ba316defb7d9cfe78a2f26a46e44ace0ec9af418a0dd9dd
186 Risk Score

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 0.9992

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://xajibur.ru/strik?utm_term=how+to+write+30+minutes+as+a+decimal PDF link annotation
    • http://gagivukamuw.getenjoyment.net/xemojogivebisig.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/update_quicken_2015_auf_finanzmanager.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/tupevatuzadusawibata.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/80875035775.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/how_to_determine_shotgun_shot_size.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/86363332358.pdfIn PDF document text
    • http://jupapopikok.22web.org/pejekogoxofifido.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/0ca83.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/6252d30c.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/honda_eu2200ita_2200-watt_inverter_gasoline_portable_generator.pdfIn PDF document text
    • http://sarotofo.iblogger.org/setiwomiw.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/kekagu.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/dagolurix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofewodugap.rf.gd/6534625971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb1136b-3607-488c-b549-3debc37c2933/89753401729.pdfIn PDF document text
    • http://wowadepadon.rf.gd/jowawijexiwipifomegix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9a7a4a-62fc-4c76-bca4-5d19722d6d66/54202514577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4dfb18e-9b50-4161-9232-a414863810bf/bumoxolinifosorakewidaget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c2b92f-4f06-4e70-97bc-5fdf3c4f56f5/51419418897.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/can_a_18_year_old_date_a_16_year_old_in_maryland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362ca7b2-fb20-439b-9b0d-3167864dd6bf/why_is_my_sony_blu-ray_player_not_connecting_to_the_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e385872f-66f9-464c-b80d-d070f7c342f8/craftsman_3x21_belt_sander_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cf6346-2287-453d-a293-9f020adb52f3/nevuzinepetemurejur.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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 3664 bytes
SHA-256: 7d4af2e74f06206a7a6cb429d9f5175dfe9188660a65f368b67e100baaca8ee6
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5444 bytes
SHA-256: 8dc9bff6f468b9489fabcadaa5285b1b80bc6f3c298322142e5557827cf1aa9d
font_02_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 10516 bytes
SHA-256: 2603b225ed31cf88cfa8b80138f8d0cc42b1a08035361589743343bd09831abe