Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da27c2e0ccd9ec4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-16 21:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cbacd7796b838db18a0bb3904e8122e SHA-1: 1e29acc2b3e69b02edb8182f67430b3febac569b SHA-256: 6da27c2e0ccd9ec4e7eaf266eef9baa92a166934d484b4beff5f874db3cd7b45
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm pointing to a PDF file hosted on 'epizy.com'. The document body, though partially corrupted, suggests a lure related to a school softball schedule, which is likely a pretext to drive traffic to these malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=west+hills+high+school+softball+schedule+2020
    • http://lupexovagin.iblogger.org/what_happens_if_your_furnace_filter_is_backwards.pdf
    • http://roburupagosode.iblogger.org/go_belly_up_meaning.pdf
    • http://price-list.moscow/segorexesakabavafememuj4n7bf.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602c0cb608ebc.pdf
    • http://tinonijo.iblogger.org/gabinoj.pdf
    • http://reabook.online/bipozerajiwelewe1g0i9.pdf
    • http://monongzhlh.space/practice_conversational_english_online84c7z.pdf
    • https://cdn-cms.f-static.net/uploads/4489838/normal_5fd97a9ca8b5f.pdf
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5ff5c3696bd9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ravowimeju.epizy.com/dujutitemopisusip.pdf
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_c6f77c5894904873a960e92039aef73e.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_ca20914b6bb04eb19285cce42c556e12.pdf?index=true
    • http://zufamiba.rf.gd/brother_louie_karaoke.pdf
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_754b3f5e879b4232989aa70f5aa8a416.pdf?index=true
    • http://butexageteril.rf.gd/2016_audi_a6_premium_plus_manual.pdf
    • http://nabowiruxurupob.rf.gd/mozakebeperotowidadejufa.pdf
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_a2aade485ddf438fa2bdaa6188021cec.pdf?index=true
    • http://gotevamevilu.epizy.com/65372482513.pdf
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_ba21eebfd7a84b30a139399e2aa2c7a0.pdf?index=true
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_64d959639dc040fd939f4b41b4de5127.pdf?index=true
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_47c792f88c60442fa10b48d7483c136e.pdf?index=true
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_e01df57dc7f140458c9c2e97f2aa2877.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f983.bin
d71733dfe147942c0f2e04ef0be2c48150b0d3a9d95a7b886d32da41d464c854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 5612 bytes
font_01_sfnt_off00010cb2.bin
186ff5b68ee3a487a183b564ac6d033ffac461279ff0ec47b2000049edc93c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 11212 bytes

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