Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9db7c9569ef7c56…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 21:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f5a47d2d8ea1b66c80844398c70ba3e4 SHA-1: 037eac2f43de4656a0ae3b5da179b5601f62ac1b SHA-256: d9db7c9569ef7c56f1b96fb1a1b3b6da2baed7184dc674e6d13f18b2fc92e805
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'principles of the us constitution worksheet answers'. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=principles+of+the+us+constitution+worksheet+answers PDF link annotation
    • http://phulop.store/are_oatmeal_smoothies_good_for_weight_loss2a2wv.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/s1hejgh/fuwateriz.pdfIn PDF document text
    • https://dubelaxelafef.weebly.com/uploads/1/3/1/1/131164372/a5cc74e.pdfIn PDF document text
    • http://babixuxuw.22web.org/isomerism_notes_for_neet.pdfIn PDF document text
    • http://wordwild-store.com/farawozay705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fd64448c638d.pdfIn PDF document text
    • http://petersikdar.com/db_realty_annual_report_2016zelop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387411/normal_5ffba4da59c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_60551938726c0.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/sisopenidepi.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/chcqLhe/human_antibiotic_eye_drops_for_cats.pdfIn PDF document text
    • http://hotloveme.online/576282890201y9qa.pdfIn PDF document text
    • http://easy-money-cash.space/atziri_fight_guide9amla.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/rukaxef.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jghjU1H/nfl_network_on_youtube_tv_guide.pdfIn PDF document text
    • http://biomanua.website/how_to_make_chord_inversions_on_guitarzj7vp.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/hgcl3he/75166945065.pdfIn PDF document text
    • http://noluwokufemifoz.22web.org/oracal_651_vinyl_application_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498997/normal_600308d37d60a.pdfIn PDF document text
    • http://fuwonetuj.22web.org/milady_chapter_13_review_questions_and_answers.pdfIn PDF document text
    • http://complect-tech.ru/500_brand_answerslyyd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_604853b7e49f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bameganaguje.rf.gd/52686134320.pdfIn PDF document text
    • http://sebedugufafa.rf.gd/lebib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 5260 bytes
SHA-256: f0aa484f5be2cfb786d8c7b6e3b72caada2fbd3c6a8794de51469328de8daefb
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10228 bytes
SHA-256: 8a77eb6daebb9c0a64ce20e1d29181c842731796c79b73d368181f5abe6250cd

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