Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f22be4d334fda59…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 23:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba45c2bde286af8af1f962f83f28f37f SHA-1: dcf1890c50a8fa8b165c2d520dfde8b21af2b7fd SHA-256: 3f22be4d334fda59b50467a39e1066e3a8eb392365b7fadc1d001ac596679dde
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=the+giver+chapter+questions+and+answers
    • https://cdn.sqhk.co/zebimapajod/fAiIMje/14476318675.pdf
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/ce8fde9ce59cdc.pdf
    • http://usene.xyz/wesulawubidoviqa.pdf
    • http://reduslim-italiaufficiale.site/kadisegataxifesb7zi5.pdf
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/7585495.pdf
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/c999f22fbf1.pdf
    • http://netlysy.online/dajikiyxapq.pdf
    • https://cdn.sqhk.co/ruxuzobisu/RGghJ1a/my_little_pony_harmony_quest_mod_apk_2019.pdf
    • https://cdn.sqhk.co/wapuwozelob/ibRhjLF/streaming_software_for_pc.pdf
    • http://menbp.online/iphone_5c_price_in_nigeria_slotq7ww3.pdf
    • https://cdn.sqhk.co/pipujevi/jaidgg0/30003359007.pdf
    • https://cdn.sqhk.co/dagosasojo/chjfgjM/worawagamos.pdf
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/pifapijef.pdf
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/0d133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kaxukok/domijixareka.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_f2d1731e44d8469d87f7500bd5656852.pdf?index=true
    • https://s3.amazonaws.com/polojuliragam/robigeporigir.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_10f85f22e1814d48ac3371f0ddb9f50b.pdf?index=true
    • https://s3.amazonaws.com/kegovev/emirates_first_class_menu.pdf
    • https://uploads.strikinglycdn.com/files/119c4497-afd5-4019-92a7-b4ba7ed46edb/platicas_de_5_minutos_seguridad_industrial.pdf
    • https://uploads.strikinglycdn.com/files/45e4bd48-7b7f-4e5e-b36e-5f9d07c69fa4/63148959762.pdf
    • https://uploads.strikinglycdn.com/files/c7415e3f-17ba-41b7-ae98-4d84613ba737/xoxowozezagisizorejanal.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_off0000f2dc.bin
0ba0194e0aea9d35b687a672aab35613e4df89d704935204974e2078a0f8a776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 5528 bytes
font_01_sfnt_off000105b4.bin
d983a17569f97a7f0a784f4f690e7ac69351194c1d973b48f94246869fee95dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10620 bytes

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