Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbdca403e359adc…

MALICIOUS

PDF

145.6 KB Created: 2021-03-23 19:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6cc4638cbaf070195254c683970c98bb SHA-1: 7f713fe1f7d330389148119fda1e98bdebbe1588 SHA-256: fbbdca403e359adca2bb2eb18cc45914620279794f20c3947c556c1af7a589ba
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=oracle+background+check+processes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374689/normal_601ec70e11d4a.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/d8hdgiv/dizzy_post_covid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5ff50c457eb44.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/complete_business_plan_for_a_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ie4x4gh/nfl_schedule_week_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/e2LBFgf/79042484005.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://s3.amazonaws.com/sazixipame/divojivawosumoxakerujinen.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/genetic_modification_food.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/kasedawasubagoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf94129-17aa-4bbb-acba-d090b5ac8f9b/gusirifuwepalawem.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/28883477995.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/program_spectrum_remote_ur5u-8780l-twc_to_cable_box.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_bf639abc3ceb49b2a3408bdee8730744.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0151801-ff93-4189-a96a-62a2049d8830/99314835142.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/majivaxizalef.pdfIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_d27b637d1a38489fa03f1e0a4197609c.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_b0960a30f52643b0844378e866040c89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b314339d-ce63-4555-bd66-eb9b4a1108ed/66349747906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9f9990-b493-4ae2-8270-c22eb6a5c904/95842088966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d06416b-fd6b-4ac9-9cb7-30527c330560/sovejatu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/how_to_fix_the_tension_on_your_sewing_machine.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_off0001f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F275 5320 bytes
SHA-256: 00626a7ff5a581fb0a741c7c6ab253ac3405fc92e84677e8497133162cf4aa8c
font_01_sfnt_off0002046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2046B 11220 bytes
SHA-256: 9655b89fe83df14297a9e20e078be57a98911a626c5ac95fe3b0167f30695543
font_02_sfnt_off00022aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AAC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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