Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8148953ebe8729…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 00:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f61dba19909a1f34f5c67d114e933b2 SHA-1: d9c28ac0fdbe8e4c86a5b228669bb727d940d2c1 SHA-256: ef8148953ebe872951142324f238ce476c2818d1999a77fbae9561aa0d61acde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=download+top+followers+mod+apk PDF link annotation
    • https://paeonia.ch/userfiles/files/15404349036.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/59523432308.pdfIn PDF document text
    • https://preciseenergygroup.com/media/90057552397.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/25990919108.pdfIn PDF document text
    • https://kawanmto.org/contents/files/jujipilolorufe.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/lopakujulekisapi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/63873714019.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/xosamuled.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/13019542546.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/xawiliguzisori.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/denogonuraribuzedegul.pdfIn PDF document text
    • http://skomi.ru/img/files/file/limasikafazesigusatazito.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/17597748177.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/gikonemufeke.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/77154287476.pdfIn PDF document text
    • https://panama4d.com/contents/files/13986375833.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/96096095724.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/20521376191.pdfIn PDF document text
    • http://szhlfz.net/upload/tesovo.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/10651104802.pdfIn PDF document text
    • http://esangsok.com/upfile/files/34815082043.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/55549584627.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/95657625943.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/xadotap.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/34023906152.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 17600 bytes
SHA-256: b68376220b8cde06505ccb799c9752a1bee324d7c0551626dc7464f35764db8e
font_02_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 10744 bytes
SHA-256: 3cb90172e6469549cb5583d42bcfd501d6ee39c2e17da825233c13b401fcbd90

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