Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc33fad28364dff…

MALICIOUS

PDF

81.1 KB Created: 2021-01-21 03:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35d7d32dd0d4edf4e259568d5047e6c2 SHA-1: 1e5bf2b37ab2e6237215bb1d34f5d7129fad766d SHA-256: 7fc33fad28364dffe7f718f1203f340b16da7bb2de50454330b6d816b117d2df
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

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
  • 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.
  • 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://trafficel.ru/123?utm_term=why+do+atoms+combine+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411932/normal_6008bf961c0a9.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/656963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5ff8b32cb57fb.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/6599900.pdfIn PDF document text
    • https://podotetu.weebly.com/uploads/1/3/4/0/134017986/vovoxunipujekup-kidipajef.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/kisumuzebaxike.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/533554.pdfIn PDF document text
    • https://kezamipi.weebly.com/uploads/1/3/0/8/130873984/dumudonapugudozef.pdfIn PDF document text
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/butewe-zikotev-matumu.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/b94e05b7121d84.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/zazabema_lawaf_pimageseligamab.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilabopitomosif.epizy.com/korunir.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/batosama.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 1540 bytes
SHA-256: 62b3e3ed71f6a7d4fb07ab779ac108b4c08ec9314a3ef726f9eedf887458c9c2
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 5556 bytes
SHA-256: 687321cead22370beaff12d6725a6aa0265c5532d2f0e9d437c4863dea103d77
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10708 bytes
SHA-256: 0d3b87537baf009aba693bc2863462a6e9b20820ce1bbdec9096cb1ff4c30d41

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