Malicious PDF — malware analysis report

Static analysis result for SHA-256 27faaf37959fa7a3…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 03:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8a782922ec2ce0fddf3ff32526780f69 SHA-1: 07d4e737f6b525e48a8ed103a14a5f055254d388 SHA-256: 27faaf37959fa7a349ba621fd1f2e6ce7ae5b7632ba92dbf5bd3a17405114926
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links, including those on weebly.com and sqhk.co domains, are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/award?keyword=large+pdf+to+small+jpg PDF link annotation
    • https://cdn.sqhk.co/mesirunomi/ehajcje/hsk_level_2_past_papers_with_answers.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/nugudameveze_jazorijujejuse_kamuz.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jjjabif/love_island_game_season_2_answers_mean_tweets.pdfIn PDF document text
    • https://todifafox.weebly.com/uploads/1/3/4/3/134329955/nenafuwarub-vebap.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jgiitji/79916144920.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/fMXfM88/wize_enterprises_amritsar.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/TpQtjeH/piano_chords_songs_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/gfibtgu/frightened_kodo_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jePbtRf/shadow_galaxy_apk_download_special_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/fzge9QD/6_pack_beer_holder_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/hOgdkii/human_eye_drops_for_dogs_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/L9icjfT/zig_zag_sharing.pdfIn PDF document text
    • https://razivejinizefid.weebly.com/uploads/1/3/4/6/134610508/4159183.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/ricGPic/75927841777.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://s3.amazonaws.com/bopuxosavubare/42971531802.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/bacillus_endospore_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/android_auto_application_mode_release.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/subtracting_decimals_worksheets_6th_grade.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_cc7d23d3e6ee4e25b3fd96832eac7c89.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_b714d2f7069f499c934ecec87fca9ca2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/monutefexili.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5012 bytes
SHA-256: effc866a2b4d25dd0880122d8080498036c17543ed629f279d91c278dc6c7321
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10544 bytes
SHA-256: 26d228155e29e83a64b469489a70f9ad2c6c67c0a15cbbf4c64fb9bc2e32464c
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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