Malicious PDF — malware analysis report

Static analysis result for SHA-256 d826670f3d386754…

MALICIOUS

PDF

80.2 KB Created: 2021-02-09 07:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1745e86bd56af8cf58f63ae30f2a0265 SHA-1: b130d40c37d37c887f11baf7e89bc3d9a84b140b SHA-256: d826670f3d3867542e4f63934cccd65589d91deb72d6cb22da59bbc6f476a604
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to suspicious and redirector domains, disguised within content related to interview questions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver a second-stage payload. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/aws?utm_term=interview+questions+and+answers+for+accounting+internship In PDF document text
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/digisu.pdfIn PDF document text
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/paleropin.pdfIn PDF document text
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/9e7b25b92b.pdfIn PDF document text
    • http://fogarapisow.22web.org/maxunepodokaxoku.pdfIn PDF document text
    • http://pabufit.22web.org/ipcc_report_2019_on_climate_change.pdfIn PDF document text
    • http://ranomurivokav.22web.org/87078658183.pdfIn PDF document text
    • http://loginwithfb.site/250205683456vkjg.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/wexuf-nururanozuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovigebi/blf_a6_manual.pdfIn PDF document text
    • http://tuxolemoga.epizy.com/barish_film_video_song.pdfIn PDF document text
    • http://repafow.epizy.com/django_rest_template_does_not_exist.pdfIn PDF document text
    • http://dasujisetojasel.epizy.com/11147780763.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/android_apple_watch_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/apologize_one_republic_free_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/ecg_report_is_abnormal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 5600 bytes
SHA-256: 05e444ae6a0b1fccb6f60ef488e3d72f3395fe3ef767f6fddccc78a6612848e4
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 10316 bytes
SHA-256: 1ac1a1e9b2b048cf82cedd6488856fd6380f528c86c56473bed9e37732c157d3

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