Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e910024d9fbd8…

MALICIOUS

PDF

69.9 KB Created: 2021-03-19 01:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2d1e8d2f8dabde05cc9210dcc90891e9 SHA-1: 2462aa8c27609d577363e6602b33793b6c3f5dd9 SHA-256: 3e8e910024d9fbd8807641b13ecfe39acf2c3727a0c512c1c45a5327cc75045e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are the primary indicators of malicious activity.

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
  • 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.
  • 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://dafemum.ru/123?utm_term=personal+and+reflexive+pronouns+worksheets+pdf In PDF document text
    • https://gunefadube.weebly.com/uploads/1/3/5/3/135388078/mejuta.pdfIn PDF document text
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/tiganirakorijoxet.pdfIn PDF document text
    • https://gotowixupin.weebly.com/uploads/1/3/4/3/134393593/dazoragajik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff27ffe2532b.pdfIn PDF document text
    • http://pogadai.xyz/bomejufipotimet43lmx.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/3337002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484807/normal_5ff80cbd8882c.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/tukatutokifa-kiteg-tunivirig-minenuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5fe0fc7d1e863.pdfIn PDF document text
    • http://wegansit.space/poached_eggs_vinegarmo038.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/vumigulotuz-tabiraligo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6021ef90a30c9.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/484450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_6033c476cf607.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/2cba759a15.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/f96a5791a72525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_141e294d08bd4fdeba2767d305048ec7.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_3cb778c711614f59a2c7c42fe09fcd3b.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_2ea9bc1009894dadb161959d304d57da.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_b4c027f3cfb348abbf87e2cc0abe9626.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_cf989a7383fd4ba8bf5b29077194fa19.pdf?index=trueIn 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_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 5416 bytes
SHA-256: 3077bacd6007e7a03915ac54848a7186afc5e0a4ab70a88efe582d47a5a72a2c
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10728 bytes
SHA-256: d26ff32316a9f07c14b60b0c93eb0363e61572c043428d52208dce77a2c09851