Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d3dadc08827cd8…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 03:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1093f52b53cdecd3d136f100d3e11ce1 SHA-1: 62394a930818a33d4c247bcb79f987641f8be09c SHA-256: 03d3dadc08827cd8dea1c2027d5f4133bc7d59778657ba527540666665100d31
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for specific terms like 'android root apk 2020'. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection as Pdf.Phishing.Trojan indicates malicious intent. The document's primary goal appears to be directing users to download potentially harmful applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=android+root+apk+2020
    • http://jatepot.22web.org/sefogeforu.pdf
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/7898099.pdf
    • http://polfact.site/rikuwurumukupitusasitokolfgj8.pdf
    • http://onlinetiser.website/xekerogofagibaru3ml6h.pdf
    • http://olymp-trade.top/321953484711mib.pdf
    • https://kagiwegelugamed.weebly.com/uploads/1/3/1/4/131453087/dexekagarewefunasam.pdf
    • http://amsidisi.xyz/ptcb_study_guide_freeyy1gx.pdf
    • http://mexicotop.xyz/wavelet_transform_python_githube2122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d8be0e1-666d-4fb5-a8df-ff1b07078968/rgb_skin_color_codes.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_4ef28c3bf74048b98499dc9acb69c515.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc400b94-0d54-4a39-8d2c-584e486b566f/dorian_gray_book_chapter_summary.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_d1203e7754f047fab0ec8e6a50334a9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/62c22bb4-6ca1-4b1b-9d6b-0fe877127f10/cost_of_living_index_international.pdf
    • https://uploads.strikinglycdn.com/files/9cdca3cc-bc43-41b6-80eb-5856d16d034c/age_of_sigmar_terrain_rules.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_1b2b1f8b75fa4353b2bdba4da11cf136.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a99c551-93cd-40c4-a26f-87ff8a11f87e/dell_optiplex_7010_driver_cab_windows_7_download.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_badf3f1740364663861c457a5fad9816.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb12f3bf-e212-40f9-bad8-73d43251e653/is_my_wood_stove_epa_certified.pdf
    • https://uploads.strikinglycdn.com/files/a3d7f66c-0e16-4a9b-bda5-9a45d791dea4/mepukanibubesifoveni.pdf
    • http://tinejamuwaki.epizy.com/lifujaroperasunujinibul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ea.bin
75923cca39fa95a73537cc685869b6454a29d192c1a4c875f7dcd55fa27485c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5068 bytes
font_01_sfnt_off0000f938.bin
f39e706cf905cc81f5e2a5be2b4b159b4f75e329873387c4f9f6708190ae4c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10652 bytes

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