Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad9282d3783c80d…

MALICIOUS

PDF

72.1 KB Created: 2021-06-04 10:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9768eb4be3fb2f280645d53c98656202 SHA-1: 4a45c5c62024d51733aabc75bafa19110dd7f15f SHA-256: 5ad9282d3783c80d404596667b360e6cdcf8d5790394c3e34d9ec991b74fff1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'queure.ru', suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9562

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/pbw?utm_term=ap+language+and+composition+book+2020
    • https://visuripaxu.weebly.com/uploads/1/3/4/7/134711721/5807710.pdf
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/papukuxewerogix.pdf
    • https://kowawixuru.weebly.com/uploads/1/3/4/5/134509215/lufuriburax-doganu-dorirenexipopu-vogodizik.pdf
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/jupol.pdf
    • https://wazobusa.weebly.com/uploads/1/3/4/7/134756590/giwinuxasifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lakebimutep.pbworks.com/f/45837877842.pdf
    • http://gaxoxim.pbworks.com/w/file/fetch/144574935/uninvited_lysa_terkeurst.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144416955/sudukolefivemotin.pdf
    • https://uploads.strikinglycdn.com/files/cb5612a5-1dab-43c4-bbbe-7ebbb40fc740/solowo.pdf
    • https://uploads.strikinglycdn.com/files/a6fbea4b-682f-4f6b-97ac-8b008049b6de/geometry_law_of_sines_and_cosines_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8508bcda-95dd-4bae-a4ec-8349362d29e6/pumawo.pdf
    • https://uploads.strikinglycdn.com/files/994df917-03cc-4c63-bedc-4d04074438f1/72953699694.pdf
    • https://uploads.strikinglycdn.com/files/1934b7a1-d287-4062-8c3b-0b54fae87dbb/12674546157.pdf
    • https://uploads.strikinglycdn.com/files/04e23d27-c721-447c-8cbc-fc2c87a0220b/unlimited_power_price.pdf
    • https://uploads.strikinglycdn.com/files/313b200e-f591-4d93-a585-9deb0b655219/gikudidirejewaxa.pdf
    • https://uploads.strikinglycdn.com/files/231fe98f-34af-4dcf-ace3-63e4c2a3e25e/24737999669.pdf
    • http://mepijewaj.pbworks.com/f/zizaduvunorawe.pdf
    • https://uploads.strikinglycdn.com/files/419a8774-5bdc-4f75-aad6-8396026f458a/womewizuwez.pdf
    • https://uploads.strikinglycdn.com/files/4a3b374a-4dae-4646-9d37-3c0d42a49f88/1102447421.pdf
    • https://uploads.strikinglycdn.com/files/4345690c-68d2-4e4a-ae02-13d1c189a5d0/fukelinado.pdf
    • http://serizedez.pbworks.com/w/file/fetch/144599346/79584219787.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e795.bin
8daf12d03cbf3a42c0fe6dda6e7477b39864eaeaca3af4d1ae3d723e4d938ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5764 bytes
font_01_sfnt_off0000fb29.bin
132f17fd9ea7bc59483bbd3b813769af4e9ef41d01ba6205fb8d9e82fc5c2776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10580 bytes

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