Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f23ff5a772963e…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 14:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f6c3a023f559b65524a202aeb0dd5e10 SHA-1: 91e9e3bbcd77c79e83a704a7c2836a7f4cc6247c SHA-256: f4f23ff5a772963e4aafa66bc377ed97d95deb15a0502f221f73604b27aaa632
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable domains and redirector services, suggesting an attempt to lure users to malicious sites. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/strik?utm_term=casio+fx+9750gii+manual+espa%25C3%25B1ol In PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/golotuwu-vuguzofepol-guvinaz.pdfIn PDF document text
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/723352e91cfb.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/jagefodibig.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/wumapazud_vesaranoruja.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/wimukaxuxujem.pdfIn PDF document text
    • http://itagreen.fun/toxiworowhyviq.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/bank5_connect_savings48rgx.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/8c531c97adf76.pdfIn PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/meturumisupon.pdfIn PDF document text
    • http://1xbet-football.fun/myanmar_wikipedia_apk_downloada4ht7.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipipofagikoma.rf.gd/39365532253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec268311-92dc-4fc0-9ee7-d11a76ed4aa4/kajofabug.pdfIn PDF document text
    • http://xawatutosewo.epizy.com/online_video_free_android.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://edu.casio.com/forum/fx-9860GII��SDfx-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_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 5812 bytes
SHA-256: 2574e5937d215d373c442becd7ead1ec3dc1ef5806b47bb671134e9e0521894c
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 12416 bytes
SHA-256: 811d15497e51fbe2a8ade29d7568ce65721c038abda9f3e383090cd6e6555dd3
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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