Malicious PDF — malware analysis report

Static analysis result for SHA-256 90514af7699960b5…

MALICIOUS

PDF

80.3 KB Created: 2021-06-04 21:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: afc753f743c2323d5a4eefe0989ed674 SHA-1: b205d369f75fa11104b728bc32712c87e687dd31 SHA-256: 90514af7699960b57521042016cce080059b9eb843ed7c3c7f94ffe045a6d9ec
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/pbw?utm_term=deivangal+ellam+thotre+pogum+mp3+song+download+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4859821/normal_604f8885a4d6e.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/fdd6d.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/d426458114.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/nixipokidovut_tonixikek_vifela_rifimitawezuto.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/a631d0cd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60356efc12aab.pdfIn PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/vefuwi_lesezajijuzesiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5fd82567857b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144437097/guitar_tab_pro.pdfIn PDF document text
    • http://naxenuve.pbworks.com/w/file/fetch/144460176/pakuxuripobek.pdfIn PDF document text
    • http://wisarazed.pbworks.com/f/salugotavuvibevumorato.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/how_to_find_your_lausd_student_pin.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144423822/mtbf__mttr_excel.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144411726/15402790286.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/12273822316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d54c190-9e62-43d1-aab7-b495d6f2681d/vafilavazifodorubox.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144572325/53298732479.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/6850400866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5442c978-a123-4d0c-8c0c-819603847090/xunisevuxopofuderi.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://scripts.sil.org/OFLIn 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 5688 bytes
SHA-256: 26d20c92e736e10476f712c879a883ad4285eb200e707198a43df964766ddf8b
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11512 bytes
SHA-256: f08d078fb2e930e1d3e70f1e784b20598320283b7dc1d441fe1946b45aade635
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16744 bytes
SHA-256: f8d7ac90b8a98037e437cac5de609e4101b2108e0b1a5a1aef30ab6138146793