Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e7f919382581dd…

MALICIOUS

PDF

63.8 KB Created: 2021-01-23 13:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 49d607dd1d79b9677b5a5d243d7c6da0 SHA-1: 544f80eac801e99b1a357fbcbfb0a88732963691 SHA-256: a2e7f919382581dd2f2a7ad5d1c7c20756e5fdbc0cf6a2a37251dfa1d842c3b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though partially corrupted, suggests a lure related to 'Ecology unit test answers' which redirects to a suspicious domain. The presence of external URIs and link farm characteristics indicates an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/aws?utm_term=ecology+unit+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5ffb3280c339b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fdd8770544ed.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/borat_salevu.pdfIn PDF document text
    • http://befemuvejizu.22web.org/guidelines_esc_endocarditis.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/zurufoxavevo_bujavodijuguja_juwimiwubotabev.pdfIn PDF document text
    • http://dajumike.iblogger.org/2794652749.pdfIn PDF document text
    • http://tulotipokumubo.iblogger.org/autodesk_maya_2018_student_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5ff041e6e49af.pdfIn PDF document text
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/bomolonilewixul.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/dokir_xilif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5fddcf019943e.pdfIn PDF document text
    • http://jimubezisu.iblogger.org/dewifawivonetujakanebazo.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/redipelokutu_wunorabamawur.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/82f5631e48de29.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/9210902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levowemorunob.epizy.com/cartola_fc_pro_apk_2018.pdfIn PDF document text
    • http://keladosa.epizy.com/ap_classroom_progress_check_answers.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/vmware_workstation_pro_12_free.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/vuvipefelenotox.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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 5120 bytes
SHA-256: 18b32a4614bd2cf54093d4ab09e4496112c26d0da6cad16eb758799b116013eb
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 10172 bytes
SHA-256: 1b639811192ae75f6b96c14bf3648801925171e0ccdf5cd603b6ba69416b605e

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