Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcef6620becfd08…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 16:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dd25e9a08c200d32eba53cb6cd321ea SHA-1: 84e100e6dcc936423e2e901ec810ea8d0065cdbb SHA-256: efcef6620becfd088912644783981b8493f2da4b1daf5ca417e31e59569d8344
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=remove+duplicate+apps+android PDF link annotation
    • https://igescanada.com/ckfinder/userfiles/files/sidol.pdfIn PDF document text
    • https://pmms-online.com/assets/file/xefegodaniza.pdfIn PDF document text
    • https://cet.sk/res/file/diwukimekexiba.pdfIn PDF document text
    • http://indemo.pl/Image/files/natujutelamebanesipuzif.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/betoxumajevobo.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/rejixelamofu.pdfIn PDF document text
    • https://equimat-cheval.fr/file/65548866761.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lorofuwam.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/voralas.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24338367204.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/30671736894.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf12ee16c---wiwatudo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/garipibabaxi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/29301070305.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/66330090136.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/riwuxakiruvunumomipa.pdfIn PDF document text
    • http://clickvay.com/upload/files/sepelatadavazop.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/nepekupiwetadoruxeji.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/kagufizenaruxawow.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/ravazumabewagalazuduka.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad226c0c48---3667055859.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/gawatup.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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 17232 bytes
SHA-256: 3d7fd723795426ced91f3c2fb23651166b470837b00b26b74bb0d4131439ced9
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 10888 bytes
SHA-256: 3562c5ac12d10a75be28c30659f992eec70539331505a9b5a77f392269323966

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