Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3edd6c218fac7cb…

MALICIOUS

PDF

79.3 KB Created: 2021-05-16 01:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cd72b7b05bb848c9a7b7a71dadb1567b SHA-1: c4e7ab7387820e93cb4054b29486eeaa39ffaa72 SHA-256: a3edd6c218fac7cb42f8e5d2253df68243641c8848187a73927b3ea581edc426
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or unknown domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to diet information, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=how+many+net+carbs+for+keto+diet In PDF document text
    • http://italywow.space/towabupibosarodcue1w.pdfIn PDF document text
    • https://minawitagolufu.weebly.com/uploads/1/3/5/3/135312922/4e457c1f9.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/buffalo_classic_white_low-_top_platform_sneakers.pdfIn PDF document text
    • https://torenamabaj.weebly.com/uploads/1/3/4/4/134486332/vigajiderele_wolorak_riwaxijixebeb_kotodaku.pdfIn PDF document text
    • http://pipazodonuwadu.iblogger.org/lose_belly_fat_exercise_videos.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/ddd9a11.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/56585665320.pdfIn PDF document text
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/wigewedoseluzaz-xajopitimosem-zozulojadumebuv-zupusudeni.pdfIn PDF document text
    • http://malespw.xyz/35732377782ahuwg.pdfIn PDF document text
    • http://bokubewere.22web.org/16684254969.pdfIn PDF document text
    • http://magawiwove.22web.org/schumacher_battery_charger_xp2260-ca.pdfIn PDF document text
    • http://paguwob.22web.org/vlookup_hlookup_pivot_table.pdfIn PDF document text
    • http://fineagencyy.com/zalinonirasoa2fyj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_6d3f90f55269454f9f19e1c44f27ac2d.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_4e150ff7481e45f8930da3e851beec78.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bf920b5d4bae4639a82c5db56ece976f.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_0383236de4bb464f81a85a179c6b918b.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_39cab219e4a845ff81d5ca1cac6147bd.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_c2d1e18f863449448c600241e8d39039.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_fce02f51661a4c9cb64fce8cd8158195.pdf?index=trueIn PDF document text
    • http://xesufarojix.epizy.com/23458596100.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_2b8c5c4c46cd40579b6d3031e1eaf77c.pdf?index=trueIn PDF document text
    • http://zabazajalugawez.epizy.com/54633957110.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5492 bytes
SHA-256: ae47f971ba0af1fe51c5bbf36ec59962c198cba2462c79960863486e19a079f0
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 11236 bytes
SHA-256: 20f2c93f211ecad813819dbe5fd16b8550b0936f483be1af4bc6a8c033638d18

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