Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b0c457a8ca8c92…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 12:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d0f974141d70b8ab2db8b628fbd8d47 SHA-1: ab04e8cd4997428e5952c43df11acc2a08093d53 SHA-256: 34b0c457a8ca8c92815b56335c37c9731d292ac3d39afadd9306f3ee33766d7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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 http://maihome.hu/admin1/file/famenovojavebuse.pdf In PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/wetogokisabelab.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/14993201659.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/19d395d99a2fc9d587432459c913fe97/pefolobejaniku.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/27885288252.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fasaxezotemoxedoweris.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/84600776447.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/93372476392.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/xijov.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/85448009323.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/sewomusoterofivunabom.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/mubotovozoxakavi.pdfIn PDF document text
    • https://masukpt2.com/contents/files/54373920666.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50354839459.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/92448463820.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/24870493364.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/47898347358.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/55263490867.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/walixosikuwi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/zogulegokomatidejaka.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/60116343344.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613491a4c04e7---vofajemolipokojomemovapu.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/95026132527.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rejarevonosukutuvivisasid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mi+watch+lite+sleep+trackerPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10416 bytes
SHA-256: f49d5b4b5e20845c855a40673fcafa9838b9162d93cc883d381f985b2acf5fc7
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 17764 bytes
SHA-256: 3168231ddf56f1d9d373adb3aec7359570e1724d54a812bcef2ea9695d74d68f