Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57dc4969f2774d7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-03 22:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0379199c62f65af3c85905d770d1757e SHA-1: 2b7db6dcb945867663b636b793b1b74006a5d216 SHA-256: a57dc4969f2774d7bcf46b305064d6ee90b4741db869876b8d7ef34cd3e94683
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing or malware distribution. The PDF's structure and the presence of multiple external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=what+are+the+court+cards+in+a+tarot+deck PDF link annotation
    • https://cdn.sqhk.co/rawavuzom/hgmBDgf/early_bird_landscaping_knoxville.pdfIn PDF document text
    • http://meetsalle.xyz/74370022602s59ul.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/sXRjjgh/62727696035.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/1051008395.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/books_like_sharp_objects_gillian_flynn.pdfIn PDF document text
    • http://winoorama.fun/bhc_full_form_chemistryr3w0g.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/focusrite_scarlett_2i4_2nd_gen_usb_audio_interface_with_pro_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/Pf1Zuge/88770302168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bubezowi.epizy.com/66405589819.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bombers_web_series_all_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/blackened_scallops_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/16026880339.pdfIn PDF document text
    • http://momodew.epizy.com/iec_standard_for_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/pamuze.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 4956 bytes
SHA-256: a9dc94e8db980f0d8511ed208df83070fc8f6986cb7bf7694f8340f256f7a71f
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11320 bytes
SHA-256: 7a06d82090b3965dec1dd2c125d5d84c9d725f0ca07f5a313fbb18affa84cafa
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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