Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62e41857cd82ebe…

MALICIOUS

PDF

85.0 KB Created: 2021-03-18 03:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b66bd94d03a5701a4cb5c6f77158bec2 SHA-1: 58a26a06d4b85f2162a07b9672b272fcfb3697f6 SHA-256: c62e41857cd82ebe79edb9f2a35e171cac2c2f66acc0f8dafd8f188a5684d038
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious phishing document. It embeds external URIs, including one pointing to 'midufefew.ru', which is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/wix?keyword=armitron+wr330+manual+turn+off+alarm
    • https://cdn-cms.f-static.net/uploads/4366647/normal_60160526e086f.pdf
    • http://goodsun.fun/diduwemibiwovafolalifir030o.pdf
    • https://cdn-cms.f-static.net/uploads/4367312/normal_600a885ee6686.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_6027ea856dac7.pdf
    • http://1fps.ru/92012076605uwf20.pdf
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fdd34ec8e84a.pdf
    • http://hookup756.fun/wadawajizovemakimms5ry.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tobobowu/bhu_bsc_nursing_syllabus_2019.pdf
    • https://s3.amazonaws.com/niporofez/3682397233.pdf
    • https://s3.amazonaws.com/dejazuvorira/html_formatter_json.pdf
    • https://s3.amazonaws.com/zesixefe/74756527477.pdf
    • https://s3.amazonaws.com/fevobelijogal/poulan_pro_42cc_chainsaw_spark_plug_gap.pdf
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_5dfc5dcaf06f4740b2317ba423d9753e.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/71257277260.pdf
    • https://s3.amazonaws.com/janodojivi/android_fragment_oncreate_bundle_null.pdf
    • https://s3.amazonaws.com/kakekojezutok/why_cant_you_have_surgery_if_you_have_high_blood_pressure.pdf
    • https://s3.amazonaws.com/bubeto/36456523739.pdf
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_e91a775eb4524fc9a65ad43bf219ba27.pdf?index=true
    • https://s3.amazonaws.com/rebomedug/brushed_cotton_fitted_bed_sheets.pdf
    • https://s3.amazonaws.com/fifomi/pro_kabaddi_score_sheet_2018.pdf
    • https://s3.amazonaws.com/telasebisu/computer_building_simulator_free.pdf
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_162ff857e64f47558343dbd5e9f382af.pdf?index=true
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_c3b079866dfd4694ae3a5cbc1f3c91fe.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin
fd99e066df2147641ca3ac3d16da3f5578b3d601385b2777d4cf24940d7b8623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 4888 bytes
font_01_sfnt_off0000f9be.bin
f30d76f59ed078ff54efe50b4f44e474b90a38dcfa1f0d45d10744be6a4a06f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11528 bytes
font_02_sfnt_off0001212c.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16204 bytes
font_03_sfnt_off0001365c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365C 4324 bytes

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