Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2386e09dab4b19…

MALICIOUS

PDF

87.6 KB Created: 2021-03-01 23:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 85896e68bda25eadf96c5eb0a6627635 SHA-1: ca9c00258a8d0d80142a94013f41f302bff93e8e SHA-256: db2386e09dab4b1988ce703aedd6d5f9f5e5514c2d1a497507acdbe997a1e32f
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to disposable domains and known malicious redirectors, indicating an attempt to distribute malware. The presence of a 'Download Now' lure further supports a malicious intent to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious workflow, likely involving the download of a second-stage artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://yafferge.ru/strik?utm_term=english+grammar+book+for+ssc+cgl+pdf+download In PDF document text
    • http://tidedejix.iblogger.org/24806149381.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/55974515006.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/kakon.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jgz85ha/speedball_game_drinking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_601b427fc1dd8.pdfIn PDF document text
    • https://kukiramofup.weebly.com/uploads/1/3/1/4/131413837/rusugugujojubut-sabanipeforexok-jadimodaku.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/zemafopogazaro-pokawa-nizufifikefama.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/dEffjf8/atomus_hd_live_wallpaper_1._9_apk.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/fanagateguvoterudimozuvaj.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jdSBhi4/kotagororez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fcce45ec3b85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fde439e8db66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sefabe/duvolodosejoli.pdfIn PDF document text
    • http://susarapobat.rf.gd/orissa_treasury_allotment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/orbit_er_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/five_nights_at_freddys_full_game_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/banjaran_movie_video_song_mp4.pdfIn PDF document text
    • http://nenidexixod.epizy.com/if_we_hold_on_together_piano_sheet.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5824 bytes
SHA-256: dbfe738766fa87ed5ea641ecba37efa2394b97ae7c8d69d6c22c7b4aa5bde177
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 11080 bytes
SHA-256: 3bda97b65963c6abf49fc70c53eb22a6e96da8fcc53c6e80729c9ddfb53ddefa
font_02_sfnt_off00012f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 10512 bytes
SHA-256: be6e8607f69077817b1c1530066f9e2288c87896a783bac2a8b0b859c72a515d

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