Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b729c38075a513…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 00:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0cc77b992d8790c11cda0791e11628fc SHA-1: 0e0d45402bbc6994a0d57a14e3695aa5c6a869a5 SHA-256: 89b729c38075a513667a57c4b5bd174a56a042aa9595f1b6f267cc5732f54a37
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming, including a critical finding for a link to known malicious redirector infrastructure. The presence of a 'download button' lure further supports a malicious intent. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document is designed to lead users to potentially harmful sites, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=campbell+pdf+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587t In PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/aba479cf1c0.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/masadusironagurofxuk4s.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/actiontec_wireless_n_dsl_modem_router_gt784wn_manual.pdfIn PDF document text
    • https://zemotoru.weebly.com/uploads/1/3/2/6/132695551/vojepugiwa.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/68eec6185d.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/wawuwadad.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/addition_and_condensation_polymerisation.pdfIn PDF document text
    • http://honey-love.ru/75904543495p01og.pdfIn PDF document text
    • http://tells.fun/39977179949dsa4o.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/mijozitq8wv.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/vuzusixovogevomanepusa.pdfIn PDF document text
    • http://qlemelest.online/how_to_fold_graco_modes_duo_stroller_with_seatsztfn3.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/local_anaesthesia_in_dentistry_download.pdfIn PDF document text
    • https://kujazekomoduni.weebly.com/uploads/1/3/5/3/135315250/1850ca553f0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigufabusu.epizy.com/migaj.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_58f6891095414567bec5b153edacc1aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f893924-ae03-4862-9e25-dcfd48a2519f/konomofogola.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_834e06c811774ff9be8d356a0920c4d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc49e5b2-9b6e-498e-8a1c-e505e7e45617/remove_adobe_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f5ee1b-0f9c-4d3d-9ad7-7c8efff7cc74/xebubulab.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/32088994610.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/64679774611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6499232-eb14-425f-9f59-f2c6c19867ea/juzojejivekobexulaxixepe.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_8c602cb52fe14b90afe3d53e63d455d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b30eda-f626-4fc0-9554-4a1b7c84f08f/28042501631.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5532 bytes
SHA-256: fa0c85d744b1e8b3e23c5cb87367c892f8f881b26447b270ae66e32d10bf4ca9
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 22316 bytes
SHA-256: 8500985030f749ef327b22842e18091e8b73b4b03601b43adb869ec2a0cfee11

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