Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a963915793ae2e5…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 17:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c235ebd9e7936d9f96c07485db1faf23 SHA-1: cfaf70eaa5a85f722e93761dc6fdae9477e47b05 SHA-256: 8a963915793ae2e5fdd40adb7b9f14f666032af833dacaf9ae9a45ca5d758b12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being `https://jumiwimov.ru/award?keyword=farm+animals+coloring+worksheets+pdf`. This behavior, combined with ClamAV detection as `Pdf.Phishing.Trojan`, strongly suggests a phishing or SEO spam campaign. The ML classifier also flagged this PDF as malicious with a high probability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=farm+animals+coloring+worksheets+pdf
    • http://lnstagram-verifedbadge.com/20863308356fegs6.pdf
    • http://uscovidcharts.com/how_to_calculate_the_radius_of_a_cylinder_with_volume_and_height2pm82.pdf
    • http://thesimplycompleteseries.com/beach_party_craft_summer_high_school_adventure7v466.pdf
    • http://zapemik.iblogger.org/samsung_sdr-5100n_manual.pdf
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/9732467.pdf
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/141426.pdf
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/sudijaj.pdf
    • https://subamepowesita.weebly.com/uploads/1/3/4/8/134875458/83c900f.pdf
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/15cda91.pdf
    • https://wufomuwu.weebly.com/uploads/1/3/0/9/130969972/ridagufozerib_zotap_gowunipaz_xunepor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ponadenu.epizy.com/cash_passport_user_guide.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_b0ba430bb8e34aa79ac825b290b71411.pdf?index=true
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_40b1120d7b1b407c9cc299554c73cbbc.pdf?index=true
    • http://rojarapimavokiv.rf.gd/2011_chevy_traverse_3.6_oil_capacity.pdf
    • https://uploads.strikinglycdn.com/files/329f920a-3f3c-47ae-874d-dc4fd62a9a5a/how_much_does_a_esl_teacher_make.pdf
    • https://uploads.strikinglycdn.com/files/866ce750-f008-4ef9-a0b7-a7c310b4cb8a/64939218514.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_05afc6871b334bbaab4573bdfdadb194.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b15300e-ecc3-4504-8564-991ecbd112e8/why_does_my_rca_projector_keep_turning_off.pdf
    • http://sazojojuw.rf.gd/bengal_tiger_movie_songs_teluguwap._net.pdf
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_79b29a06a6e148b193300f2e0cfcdb4e.pdf?index=true
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_f180d4e8fe9a414999253a69c3329ef3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbc.bin
2143d0e5a5dd1d3cfad6628a64737c7916715352c1cbe56ed74449fe9a232799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 5468 bytes
font_01_sfnt_off0001002e.bin
8f8116ba6f2a32593da9b150e1aae5d1bf80459e890d2a79786f183aea797166		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 10584 bytes
font_02_sfnt_off0001246e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 4324 bytes

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