Malicious PDF — malware analysis report

Static analysis result for SHA-256 963ac7bc9c784012…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 08:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2b227238b326da68f14ee13ccc8aca1 SHA-1: 57bff2e5eb27b1e696b3f9bbd173a1f5ab0ec43d SHA-256: 963ac7bc9c78401237c0615ea61356f7fb7799fa0a0543c0d75af9a9bdf96f1a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://nipisod.ru/strik?utm_term=dream+interpretation+many+pregnant+with+twins PDF link annotation
    • http://strita.space/kotofogegngml.pdfIn PDF document text
    • http://polikarmonolit.ru/subtitles_of_accidentally_engagedsd630.pdfIn PDF document text
    • http://poriwesebu.22web.org/97524882524.pdfIn PDF document text
    • http://notdull-eng.online/lg_tv_47ln5400_no_pictureyoxax.pdfIn PDF document text
    • http://murunabo.iblogger.org/50513895897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0798d7-3e89-44b3-8769-7b33261e1b09/gulewavamowekobe.pdfIn PDF document text
    • http://mifofofavu.rf.gd/zejixazabexebixokizozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3651599a-cef5-43f8-9c98-7a7afe3468e8/skyrim_ps4_mod_load_order_guide.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_7c8363da71544c1ea0ed7e950588e914.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_9933dad645e543b3a8fb489111d5c4f8.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_fc1d99d0ff4a455b9d773fc105e8d8d8.pdf?index=trueIn PDF document text
    • http://wabipoxagapez.rf.gd/92471357093.pdfIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_fedf3009d2cf4dbbbfdeb1b0837c7c6f.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_9d307fd68b1941418367377288ee1bfe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e2ae02-ea05-40d1-b945-e45d0fa262cf/jedupiwiziwulowuselowegom.pdfIn PDF document text
    • http://nigobabu.rf.gd/ponetuvokugezamikufikivu.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_c6543a3309da4fd3ae717442d8e794e5.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_2c270471c1394096ab9386e8accc6fa7.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_d215e6700bfb4fe692880ea5ea0befdc.pdf?index=trueIn 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_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 5392 bytes
SHA-256: d029f2eb048f06ef8450ba1c83eaff2f291c232b63f2019200b19c4a493c4edf
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 10872 bytes
SHA-256: 4e42aa890820870c393898b2cb69a9ffb3a961c6bddfce02785e4771642becb1

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