Malicious PDF — malware analysis report

Static analysis result for SHA-256 00035898a8e3c3ff…

MALICIOUS

PDF

71.4 KB Created: 2021-02-06 15:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 72f2671ca0e5b42ad9041b0a451ba540 SHA-1: c3b779f3366e907e31c1fd82c6a7c0a7c6965d8e SHA-256: 00035898a8e3c3ff637fff4470115950ecb01d286409e3e88912d919281a789e
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple links to redirector infrastructure, including a critical finding of a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cheat engine' and 'uptodown', suggesting a lure for software downloads. The presence of numerous external PDF links and a specific instruction to disable security software further indicate malicious intent, likely to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://yafferge.ru/wb?keyword=cheat%20engine%20en%20uptodown%20com%20windows In PDF document text
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/734405.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/wapamewavuvug.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/rowuzuvuvexawu_zoxakoxajis.pdfIn PDF document text
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/mapofovipagu-pabiwabawigix-poremebus-gawejubud.pdfIn PDF document text
    • https://xodobojedabime.weebly.com/uploads/1/3/4/6/134675451/1224589.pdfIn PDF document text
    • http://shortsomfj.space/kodazonikugomemuwufro825.pdfIn PDF document text
    • http://goworudubilit.iblogger.org/hard_math_printable_worksheets.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/7c083eb80e4e87e.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/6cb861d2d.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/kelukakeb/europe_geography_quiz_questions_and_answers.pdfIn PDF document text
    • http://dipuvomefig.epizy.com/bigisazavuwuzipax.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/gofevimirufika.pdfIn PDF document text
    • http://tajisogekumobuk.epizy.com/rolawuzirigidobot.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/xeranewikazagisamumoza.pdfIn PDF document text
    • http://tobitutivarod.epizy.com/pufijigok.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/39972113633.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 5356 bytes
SHA-256: b1296946e38acf032a568798b48206bf727a5da4e7272e92fb049e9ed1c96f9d
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10184 bytes
SHA-256: 4fc1aa8f915bbaa234f0899e7f281484f400cf8c07c7482209c12a4bdd482587