Malicious PDF — malware analysis report

Static analysis result for SHA-256 edaed0c16ba324a2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 01:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab9b1cfc4242c07e790c4aac3be5c8fe SHA-1: b55b28c43e17491e73145eacac06f9a25f001a88 SHA-256: edaed0c16ba324a226fb8e17f4117b9f620638f2a4fdca1d0dcb674d4fe28339
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to phishing or malware-hosting sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=face+jugs+edgefield+sc
    • https://static.s123-cdn-static.com/uploads/4445129/normal_5ffa9476bc410.pdf
    • http://lutirojibafap.sportsontheweb.net/wapiregetisuzu.pdf
    • http://xiwesesakuvel.medianewsonline.com/5139077601.pdf
    • http://rijigikesezaga.mypressonline.com/puraxirixafitabigepuv.pdf
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc92fddb9a79.pdf
    • http://bikejesoxatelo.mygamesonline.org/auditing_and_assurance_services_7th_edition_test_bank_chapter_3.pdf
    • https://cdn-cms.f-static.net/uploads/4386609/normal_600e4164eac4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabom/66308103040.pdf
    • https://s3.amazonaws.com/jivamubug/comparing_fractions_worksheet_3rd_grade.pdf
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_7b14b2157e814fb3a3d31ff54b8d87fb.pdf?index=true
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_4e935e3f77e04443a7b3eb9eedbab597.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_fba5e350811a428dafbfa5bb61dcfbe0.pdf?index=true
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_628129fdc8be442aaef4eb6e69c7bc1f.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_5094b336ab6b4c249813fe18245ad4b8.pdf?index=true
    • https://s3.amazonaws.com/dalava/grade_2_phonics_test.pdf
    • https://s3.amazonaws.com/vidadaviwal/karyotype_worksheet_key.pdf
    • https://s3.amazonaws.com/dukavunivifa/soluwetamodeneromix.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_23aea8cb7f364aba8c4d5877e49dd542.pdf?index=true
    • http://muvemaxadal.onlinewebshop.net/41458024184.pdf
    • https://s3.amazonaws.com/sefabe/xujositawoti.pdf
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_cff575d02fcc480c87d531bc5bdb0e90.pdf?index=true
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_b588ce230eee4b76ac012540da89c035.pdf?index=true
    • https://s3.amazonaws.com/zafijukopa/animated_bible_videos_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
bf2197f77902e82ff040c7258f66bb6718ff7356054629c756ed4e871c25d45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 5124 bytes
font_01_sfnt_off0000fc83.bin
ad07f1a0d10b559bfb9b99ea8b505cc2d68570290df580ba17730757428baf63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 11116 bytes

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