Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e61f4560b3f606…

MALICIOUS

PDF

73.6 KB Created: 2021-06-09 07:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 178b00eab9dc581d29f95ab8a3e95e22 SHA-1: ae3b9636000184e38ba26f6935729cd9c9430347 SHA-256: b1e61f4560b3f606c24834e36ba16d8854735624792a7c285d843c28b3e0f2f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a high ML score. The document contains numerous external links, suggesting an attempt to direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a likely phishing or SEO manipulation attack. The presence of external links and the ClamAV detection point towards a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://archism.ru/pbw?utm_term=cursive+writing+blank+worksheets+pdf
    • https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/rubimimot-gelijopupasel-sudaxedif.pdf
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/lotapafadibef-jogarot-fupimabuwogab-gegure.pdf
    • https://cdn-cms.f-static.net/uploads/4449768/normal_605a580aa1491.pdf
    • https://cdn-cms.f-static.net/uploads/4406482/normal_603f8df3d8203.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_6049e7c86df7b.pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_6038e0118a4a0.pdf
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5ffea04763589.pdf
    • https://cdn-cms.f-static.net/uploads/4501774/normal_6026813aaa49c.pdf
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6035e3c121ffa.pdf
    • https://static.s123-cdn-static.com/uploads/4416327/normal_5fef6f22bbc8d.pdf
    • https://gupuletafajural.weebly.com/uploads/1/3/0/7/130776102/nomizisoj.pdf
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/1537083.pdf
    • https://lawawumusew.weebly.com/uploads/1/3/4/7/134765042/f87c9.pdf
    • https://cdn-cms.f-static.net/uploads/4454054/normal_604729b103533.pdf
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60beaa0e92f4e.pdf
    • https://cdn-cms.f-static.net/uploads/4450638/normal_60357682752d0.pdf
    • https://static.s123-cdn-static.com/uploads/4412396/normal_5fca124642f4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pijipusap.pbworks.com/f/15394583865.pdf
    • https://uploads.strikinglycdn.com/files/575066d5-e3df-4e49-bc01-1c174585c71a/examples_of_rapid_diagnostic_tests.pdf
    • https://uploads.strikinglycdn.com/files/fa0cb274-7eed-4558-9f65-3cff16d5dc70/does_magic_mouse_work_with_ipad_air_2.pdf
    • http://namikikis.pbworks.com/w/file/fetch/144507288/laboraxiletir.pdf
    • http://zosajivapesi.pbworks.com/f/how_to_operate_casio_touch_watch.pdf
    • http://zikasamu.pbworks.com/f/critical_ops_unlimited_money_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/6327b941-35a9-41e7-a9f7-17946c34808e/rorukolipozusi.pdf
    • http://mogulazedub.pbworks.com/f/what_are_the_disadvantages_of_qualitative_research.pdf
    • https://uploads.strikinglycdn.com/files/30ea412a-a6b0-4978-80fd-8a9443864dc7/how_to_dry_only_on_lg_washer_dryer.pdf
    • https://uploads.strikinglycdn.com/files/d8354874-6980-4e2b-a441-3612455b574a/jaws_book_author.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a4.bin
034eecb5886d99609ec93942b0c498603ad9301043f74951771a18caf9e528c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5564 bytes
font_01_sfnt_off0000f498.bin
d11d9460d5c429a0f779031477614b417256539af706b25678b0ce95c39c1e16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10576 bytes