Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ae19a427676d05…

MALICIOUS

PDF

84.3 KB Created: 2021-03-29 12:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bb682bb668543e44d3762bfb8f5ad7c9 SHA-1: b09ffb193498feedce73501a6fef5671a05841dc SHA-256: 51ae19a427676d052ad74b416653151dbaf340c9bd336da5175bf8b881ef06ae
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 0.9990

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://druttle.ru/award?keyword=aprender+a+leer+solfeo+pdf PDF link annotation
    • http://kvadro63.ru/char_broil_smoker_instructionsbe490.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/befolimiseterog.pdfIn PDF document text
    • https://boriduleloson.weebly.com/uploads/1/3/4/0/134012687/6476131.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/6860360.pdfIn PDF document text
    • http://vitalia-transports.com/hello_bixby_apk_for_oreosexgy.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/6471831.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/7507320.pdfIn PDF document text
    • http://qupieasy.online/xbox_360_error_code_e68_fixjxval.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/sajuniriramuti.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/xedabapazugeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/19754000631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9236f3-0d3f-4fd5-8012-c57985a93a1c/bekanixox.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/telefono_grandstream_gxp1405_manual.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_c5211e4e2e4d40838eb6fee813a5d47c.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_92e27ee3fc3240239543feb5964b6996.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad77a855-9120-4007-a531-81fcd5efd90a/singer_promise_ii_bobbin_size.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_595eab04479340248ac37e51923db1a9.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_8ebf08b0939942f9a0053a6a28f87909.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6a6ac9-a4f5-49fe-b2f3-d508f43ee0e2/what_is_the_spiritual_meaning_of_a_pink_rose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa4c53f-0b15-4e5d-a80e-e3f84e787dc4/how_do_i_fix_e14_error_on_my_bosch_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82d783b-9c3b-403a-ad6a-25fbe80f6f37/2013_jeep_grand_cherokee_overland_curb_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/calendario_2019_escolar_2020_sep_oficial_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/nozupazanuranoxo.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_9e8c22fb029c4daaba956c230d73e1f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/39153542367.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5024 bytes
SHA-256: 8212571b002877b109aacc2e9e69d17c6f9869bc672c35e98cf47302e88524fb
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 12272 bytes
SHA-256: 1641219d61cf67dcc59c225324a84791a832742aff6e2bfe1512c6b70f47a086
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 16200 bytes
SHA-256: 9527d77a8ddbff7143f4b9d9ffa6a9c0a17c14fbd864be9d9139927b2451880e