Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e709f055b5c8bc…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 12:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90f008ca83db1bacf1b9e13a57e62079 SHA-1: daccf3da2e9a8c8e5d86334f45b87139c313e350 SHA-256: d7e709f055b5c8bc6bda7b4db375d8853a2547297e926c038d664c0125c8f419
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://resalured.ru/wix?keyword=wifi+password+revealer+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463528/normal_603d5a29ec1bf.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/i7sjdAp/scary_teacher_3d_free_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fe5293b706a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_6027ea112d55b.pdfIn PDF document text
    • http://numelulor.iblogger.org/english_words_for_daily_use.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/jNVUhWQ/66094769429.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/a5ggxou/99010370582.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://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_d0fd78d531ca4a2b8461432460b2de29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/uncheck_radio_button_onclick_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/facedesk_for_facebook_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/lesatiped.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/28116206079.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/xuvojiloponowisifetese.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/nexesesotu.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/chintakayala_ravi_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/kundalini_guided_meditation_kelly_howell.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_39c3a1a23b544a92a6b330afda4806be.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fc37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC37 16948 bytes
SHA-256: ee09f9682c7f3470de38df904eb149914ec2a530019e3155f5b90bcc975ea39d
font_00_sfnt_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 4972 bytes
SHA-256: 1a10153f8394d2568dffd2fa2187029b81027ff8e13085fa1904232595d93580
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 10252 bytes
SHA-256: 0df31a12aa2e9fc1aa2fcff21c7b745b7a5ab325c9510a9245f2cc79e9f6f84f
font_03_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_04_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 4152 bytes
SHA-256: 4093f9d76c49f4fe525f7a8b1942aedb7761f3ecdd5380029ad2cbe2b793a127

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