Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82972a48ba487f1…

MALICIOUS

PDF

79.3 KB Created: 2021-04-23 17:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7173b03bdbcac810c1f6786b90613a81 SHA-1: 934a26bd0258f377744c6e526a35127eec4974c0 SHA-256: d82972a48ba487f1f5a32845d96e20bad45cb6283a02d53c03af8b8889d11f3d
264 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The presence of a malicious redirector link and ClamAV detection strongly suggests a phishing or malware distribution campaign. Although no scripts were extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crophysi.ru/strik?utm_term=cuando+empieza+el+tiempo+ordinario+2020 In PDF document text
    • https://cdn.sqhk.co/tovipovo/eD5RLkm/zusotoz.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/Whhjdij/offroad_bike_racing_3d.pdfIn PDF document text
    • http://freehookup.xyz/23876458068eqfwl.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/HjhtnHs/filakepasulerezupim.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/fojahdR/48154793834.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/izPwyzC/82270829981.pdfIn PDF document text
    • http://laditosos.iblogger.org/tureme.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/hjc7ihh/91797411010.pdfIn PDF document text
    • http://chunyoo.com/gofuwn0miy.pdfIn PDF document text
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/watamixexite-fobanagavu-gulafe.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/7ca8b5ce.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/VihrKck/75774889386.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/baumatic_induction_hob_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/gdjhVif/16250581563.pdfIn PDF document text
    • https://birinubawode.weebly.com/uploads/1/3/6/0/136026057/7285000.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/7aDOiah/1000_words_essay_about_myself.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/SihFZhg/85753194569.pdfIn PDF document text
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/882e7ee571a93e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/woxewiwupir/weight_training_for_soccer_players.pdfIn PDF document text
    • http://kulefomesali.rf.gd/50_activities_for_developing_critical_thinking_skills.pdfIn PDF document text
    • http://nujivoforegiv.rf.gd/project_on_anti_plastic_campaign.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/bubozuvigivatijat.pdfIn PDF document text
    • http://ribaxekag.epizy.com/anaconda_full_movie_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/45039406890.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 5156 bytes
SHA-256: a70b80179fdf59e0c90729505d9944605e68c8ea23e437bec53dac7193e97c40
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 11124 bytes
SHA-256: b06aa0c66ef53aadff5c9d98750bbee020f3d53f100fe633045715f25a619a15
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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