Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1023c4021d6948…

MALICIOUS

PDF

110.1 KB Created: 2021-02-23 04:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a170c8bac21316acf84565ed69313ac7 SHA-1: 5c5cc366133a797d1875935b23bebcb1f90a5340 SHA-256: 5f1023c4021d694835adb98e40f84d3e129fc83e5e7acc07871de451d8445fa4
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=apk-dl.com%252Fstore%252Fapps%252F+details+id%253Dcom.antutu.benchmark In PDF document text
    • https://cdn.sqhk.co/reposivekow/hitlPjf/rv_parks_near_mexia_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_6000c3c2a8202.pdfIn PDF document text
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/nekidexoxikoxa.pdfIn PDF document text
    • http://fherixq.com/bryson_tiller_true_to_self_download6w892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_60342df5cfc70.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/flashlight_off_on_iphone_8jtgia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5ff4e116b5c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_601f81d3d5e0e.pdfIn PDF document text
    • http://forkidsshop.online/the_purge_election_year_full_movie_djg2jp.pdfIn PDF document text
    • https://wisevagidigo.weebly.com/uploads/1/3/0/7/130740356/4248099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fceda2237e7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_5fdeb30932850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_6020182f8231a.pdfIn PDF document text
    • http://canlisohbetim.net/que_es_el_centralismo2m150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A5 5096 bytes
SHA-256: 1e0b3dd31ba065ea87f2b45085c04388e0a9699ef11fbd97b0f0cfc33675ea9b
font_01_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 5536 bytes
SHA-256: 9e7aa9b2c90f991b64795516f498a0362ead0392012ee0aafc3ec0f184636385
font_02_sfnt_off0001692b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692B 16508 bytes
SHA-256: 623ac4fa0ac959718e315722688375bf0d4d2e1fcc6f43a4bba09a467e642326
font_03_sfnt_off00019c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C31 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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