Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c66a4a8781c6b…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 266ff06191cec1b93d38a15756a83332 SHA-1: 239d4cae4c93530e9bbe30e4da638dba60bdefb4 SHA-256: 552c66a4a8781c6b95e183cfd212314350e3ce7ca34e81be5c2ee72f049b71fc
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL disguised as an audiobook link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple disposable hosting links further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=nest+in+the+wind+audiobook PDF link annotation
    • http://liberum.sportsontheweb.net/what_does_the_bible_says_about_hard_times.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/tesugoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_605057dbe792f.pdfIn PDF document text
    • http://stal-kemerovo.ru/pression_osmotique_exercicewwx78.pdfIn PDF document text
    • http://zolepop.mypressonline.com/reading_comprehension_passages_with_questions_for_high_school.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/bookkeeping_1_tutorial.pdfIn PDF document text
    • http://reestr.site/18257668020vq21j.pdfIn PDF document text
    • http://canonsburglake.com/skyforce_unite_technologys4h74.pdfIn PDF document text
    • http://blaugrana.ru/44089501340bf06t.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/rovarexafe.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/zigipafujojijodator.pdfIn PDF document text
    • http://petersikdar.com/the_second_sex_full_texthksjy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fe917767b0a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafexegud/17169107116.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_7e454cbb0c45486481a282089cb9a462.pdf?index=trueIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_d86bd66dd88d4cfda8b483cfe9c8fd77.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_c00d28849a414161977a6c656272fabb.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_637a1b45123448bfa8e08ed81361faa8.pdf?index=trueIn PDF document text
    • http://pugazapuxijal.myartsonline.com/livro_administrao_da_produo_moreira.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/resnick_halliday_physics_volume_1_download.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_439be03abeb1492e961bde1fac71815e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/91300931039.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/beder_meye_josna_full_movie_720p.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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 5048 bytes
SHA-256: ec7ef45f24feaaf3e58c832d8a4583b2ebc7ad18008ac60181925486dec5e17a
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10672 bytes
SHA-256: 0d0697e0ba674806bb090c9a6fa0db7de26c337e554e7aafd7999b58e2abb3fb

Open this report in the interactive analyzer, or submit your own file for analysis.