Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f08c5882dedb64…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 00:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e4b53b482d754ca3745c5599595bc19 SHA-1: 39f29cc145af03001a63a943aa39aa4adc04440e SHA-256: 76f08c5882dedb648d0134931251bc90eb70d6058d7a2cb5daebd91dafe83d91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is a direct link to a file download with a 'window 10 64 bit iso file' UTM term, indicating a lure for software downloads. The PDF's structure and the presence of multiple external links suggest it's part of a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=window+10+64+bit+iso+file PDF link annotation
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/57111039364.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/44695848905.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/wopiwo.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nimosik.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/lizikalexarugorijejavita.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/fetononepinite.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/widowatebokabibisopogis.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/62000579400.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/90541193736.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/naxuropozaki.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/76590757559.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/sufipogadofejizebefivanu.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dapuwevaxajovu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/98808229207.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/duvewegawisarube.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e42588a01---garadaxobekapitoligaso.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/tasazexamivofode.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/dunupa.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/naxeverodagavovadise.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/sasikekabomezovaruludu.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/xewoxewakubefelubelif.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/91077514282.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/sagakugesajurakulew.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/757b9121749c90dd5907278b50ba360d/luwunisaluduza.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://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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 18412 bytes
SHA-256: 863d42311bbe91d456abda5a56b732c5fdf919c8f5609fc2e4d226f591106371
font_02_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 10724 bytes
SHA-256: 9a05c7a0c944cc6b6694d99dacb9ff74c02cc4bcf07e2f5935cb410b50f5d60b