Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fcf6f407b89731…

MALICIOUS

PDF

68.9 KB Created: 2021-03-10 13:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9032136ca0f233be0edcffb93a938d1 SHA-1: 96e7e46a9210d2cc412e1e6b4ecc5d87445c60f1 SHA-256: 10fcf6f407b89731fb060018fdf693bca7f2f5989938d2f63322a7b98934282b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing content. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=wh+phonics+worksheets
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/xijulotifawaba_wonedubina_xejeb.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fdbe267295f4.pdf
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5ff4fa51e0e12.pdf
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/dba6d89d3.pdf
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/84d5de2338d5ba2.pdf
    • http://ferafukapawap.scienceontheweb.net/90540709372.pdf
    • http://zejageja.iblogger.org/18959554326.pdf
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/bc22ea9e10249f9.pdf
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fe8be7f26afc.pdf
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/8632334.pdf
    • http://diporesorojina.scienceontheweb.net/mobility_scooter_battery_box_wiring_diagram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://relelefaxup.epizy.com/11781816949.pdf
    • https://uploads.strikinglycdn.com/files/b9547f85-b875-4240-847d-e64f6412bc75/kawonupiwi.pdf
    • http://guwepenusabuk.epizy.com/coleman_powermate_2250_watt_generator_manual.pdf
    • https://uploads.strikinglycdn.com/files/7870c07f-ab15-45e0-ae19-39f71fe7f07f/32431409293.pdf
    • https://uploads.strikinglycdn.com/files/f91045ff-37cd-4c32-86f8-7fc2df18310c/7919256044.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_off0000d207.bin
f8f7ea4d7e300a4ab609da987276ec1d20713ae4ed2f6cc9c69619bdda169ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 4948 bytes
font_01_sfnt_off0000e2f2.bin
45f77c850b3857f222dc5a3910a6a2a3005baadcd64b519be84f7da9dcc10ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10556 bytes