Malicious PDF — malware analysis report

Static analysis result for SHA-256 5898fed2a5d30114…

MALICIOUS

PDF

103.9 KB Created: 2021-03-12 14:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe1b4354ab5be956775e16c3ea6333d0 SHA-1: 557d8efe9e3fd343f1a7f62ee6a698a5a5777785 SHA-256: 5898fed2a5d30114b6a3137210d04180f3967f4d4095068760cc6f8028f3a89d
146 Risk Score

Malware Insights

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

The PDF contains malformed streams and external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mezovuduw.ru/award?keyword=singapore+airlines+company+profile+pdf PDF link annotation
    • http://merexazumebenag.medianewsonline.com/new_baby_boy_names_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/dmSigij/95075552408.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/14575949623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_602e66fc5f999.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/WggxIgj/wotijejevademinaramil.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/xuredasunisan.pdfIn PDF document text
    • http://farotosinotom.mywebcommunity.org/airtel_money_rates_uganda_2020.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/how_to_teach_character_description_ks2.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/how_do_you_do_ratios_with_fractions.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/samsung_nx_300_price_in_pakistan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_6025a17cb9a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_603fa9fc63471.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/shall_blacks_law_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0452d0-e8ef-4fbe-a4f0-c8e671e90765/vobuwitem.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/corel_draw_x4_keygen_generator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/windscribe_android_not_connecting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8caaed-650a-42d8-9023-422eb6faf650/3643381710.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_off00015b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B42 5680 bytes
SHA-256: 68abe5e6882f11fd2056ed85394d353762f58fb6caa13792969c3d27742ce8f2
font_01_sfnt_off00016e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E96 10424 bytes
SHA-256: 6226d1e457d6ad8baf460c8674077deb1432fe3747ac2e2bc903999de527f7e9

Open this report in the interactive analyzer, or submit your own file for analysis.