Malicious PDF — malware analysis report

Static analysis result for SHA-256 320c1e3b48a178bf…

MALICIOUS

PDF

70.4 KB Created: 2021-01-02 12:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd084c3826413acc049dd5182a645f1 SHA-1: d55f436fb038404d0ab7d1ceaf1175d0526e2b13 SHA-256: 320c1e3b48a178bf8caa50d96c0319c456e700052544b6a7517b5062149231ae
222 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to benign-looking PDF files, but one critical link directs to known malicious redirector infrastructure. The document's content, though heavily obfuscated, appears to be a lure for a "pharmacotherapy casebook 10th edition answer key", likely to trick users into visiting the malicious URL. The presence of a malicious redirector and a link farm suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=pharmacotherapy+casebook+10th+edition+answer+key
    • https://cdn.sqhk.co/zudilubal/hjjzEhd/87581987973.pdf
    • https://gikusevenax.weebly.com/uploads/1/3/4/5/134529244/7189696.pdf
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/sadakovumu-dokufudepotefog.pdf
    • https://cdn.sqhk.co/mojaribi/fMhehgJ/vuxunaripidi.pdf
    • https://cdn.sqhk.co/jutafegobexe/acqgihc/10194019615.pdf
    • https://cdn.sqhk.co/tinajugezepi/C7gfgjE/planet_fitness_customer_service_contact_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fexuror/upstar_tv_setup.pdf
    • https://s3.amazonaws.com/lupebesu/plague_inc_evolved_neurax_worm_normal_guide.pdf
    • https://uploads.strikinglycdn.com/files/82e055a5-3c71-433f-9949-a8e85a389624/texab.pdf
    • https://s3.amazonaws.com/wazorixekunafob/35970970975.pdf
    • https://s3.amazonaws.com/tosevud/laporan_keuangan_bursa_efek_indonesia.pdf
    • https://s3.amazonaws.com/betimugi/how_to_stop_rain_in_minecraft.pdf
    • https://s3.amazonaws.com/xetasif/nitrogen_cycle_in_short_answer.pdf
    • https://s3.amazonaws.com/sigobija/11498221066.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_off0000d4b8.bin
40d0bce9db32233b89d65572603fa821913494e468849bd0d7eed2c453140c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 5876 bytes
font_01_sfnt_off0000e89f.bin
f6fe04702f82ad5cd0ab92db7ee9a1aacf3ee269521f9420e7538f54d4ec26a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 10496 bytes

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