Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88085e32f7ab1c0…

MALICIOUS

PDF

66.4 KB Created: 2021-09-19 02:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 785cc7199d2a6bbe19dc623357638bd8 SHA-1: c487aae617f7bb945831a3dd6b7bc8c5c5b5fa99 SHA-256: c88085e32f7ab1c059fd695152e01dde1a17d2850311834dab348b452113e458
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing operation. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

Heuristics 4

  • 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
  • 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://drafthe.ru/uplcv?utm_term=merge+farm+mod+apk PDF link annotation
    • http://rymwid-training.com/userfiles/file/wonira.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/nivezafemuj.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/vowajusizoxi.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/34658518154.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/mapafizopukobotinudijupu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/gabenusigusuxe.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/774426897.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jawowujagomoru.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/13167548670.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/55187948326.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/viwepokisuwe.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/16587145856.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/51346449795.pdfIn PDF document text
    • https://gangnampools.com/contents/files/wifasad.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/givuwovutepugikafo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/87079027449.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/jiwikuvagisuludiror.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/32531584296.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/13878665561.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/71134809169.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/74693218795.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/35295115206.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dinakajupekat.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 16860 bytes
SHA-256: 8984b4eccc0b8c2fc065851a20c6aee0023691bd69913cb5cf57b5036e7fd445
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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