Malicious PDF — malware analysis report

Static analysis result for SHA-256 f068dc539c5b5e1c…

MALICIOUS

PDF

93.2 KB Created: 2021-01-10 17:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 22e5ca9d7b3abdd969c2cfa770d583c7 SHA-1: 9da381ceff514197499bb4123ac6491816e24b47 SHA-256: f068dc539c5b5e1ceef2f5b5f3fb2e3555da3cc0c17e9a18598a2cba1f7a9756
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to medical information, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://cctraff.ru/aws?utm_term=cardiopatia+congenita+del+adulto+pdf In PDF document text
    • https://site-1176393.mozfiles.com/files/1176393/munsell_rock_color_chart.pdfIn PDF document text
    • https://site-1172875.mozfiles.com/files/1172875/xenekadanavewusezusoju.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/halloween_day_party_near_me.pdfIn PDF document text
    • https://site-1177836.mozfiles.com/files/1177836/lovamajumenuxi.pdfIn PDF document text
    • https://site-1176216.mozfiles.com/files/1176216/4197359279.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/giGJDMe/90904394216.pdfIn PDF document text
    • https://site-1176791.mozfiles.com/files/1176791/selling_on_etsy_in_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jWjarii/slice_of_life_anime_movies_netflix.pdfIn PDF document text
    • https://site-1174464.mozfiles.com/files/1174464/zeus_s_sister_and_wife_crossword_clue.pdfIn PDF document text
    • https://site-1168088.mozfiles.com/files/1168088/rediguvakesozapapi.pdfIn PDF document text
    • https://site-1177542.mozfiles.com/files/1177542/seputu.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/runuzitexokol/hershey_mini_candy_bar_wrapper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/tafakidas.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/lokinijitivikux.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_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 5048 bytes
SHA-256: 247509ace0316e28ff1117d1e0b098992933e33c19eebb6742e5bad04ec0a0a1
font_01_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 12268 bytes
SHA-256: f7b0870870481d52af23dca6cb75db33a9744f4e6e779d1efd63aa2fb1071ece

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