Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1cd74acd6730b8…

MALICIOUS

PDF

86.2 KB Created: 2021-03-22 02:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ad807f6fb9403ba362a5a592cc2908 SHA-1: ddd706c1b5f72e919539bc1195d79aa4f14b9528 SHA-256: 4d1cd74acd6730b8b8aa511646db591b0936fe09193a8dd3c74b11a58aeb055f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'geometry common core workbook answer key'. The presence of numerous external links, including a link farm detected by PDF_SEO_LINK_FARM, indicates an attempt to redirect users to potentially malicious websites for phishing or malware delivery. No scripts were extracted from this sample, but the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://xezojetit.ru/wix?keyword=geometry+common+core+workbook+answer+key
    • http://lamejix.scienceontheweb.net/90342328182.pdf
    • https://cdn.sqhk.co/serodozire/cHJjh9P/grand_police_stickman_rope_hero_vegas_gangster.pdf
    • http://wisemad.22web.org/quicksilver_throttle_control.pdf
    • http://xomerisupudegop.medianewsonline.com/78461203182.pdf
    • http://fejukoturig.medianewsonline.com/jimi_hendrix_little_wing_tab_songsterr.pdf
    • http://dibosezufo.getenjoyment.net/kaserulabibujawela.pdf
    • https://cdn.sqhk.co/xetokive/CNYicxU/zaganolowufajatop.pdf
    • http://wajadadajevebab.22web.org/opsc_aso_syllabus_2020.pdf
    • https://cdn.sqhk.co/xovepejegosi/idguhjo/fernanfloo_geometry_dash_parte_3.pdf
    • https://cdn.sqhk.co/tuwovado/Eie7gji/daylily_bulb_planting_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_95dba6d0d2af4a8b984f14247269de8c.pdf?index=true
    • http://zujugefov.rf.gd/womutegufowaxosiworivifu.pdf
    • https://uploads.strikinglycdn.com/files/60da2902-2240-4b7e-a81d-919b05a70da1/cuantos_son_1_8_pulgadas_en_centimetros.pdf
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_02f24b7d090149cd90de5feae9f0466d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/baafc483-6428-460a-bc9a-06622dabd269/telugu_short_stories_with_author_name_and_book_name.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a6c8a2759ff34175acaa9ae5eb8eabf3.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_945a3661fe55440ea701a1cd6668c652.pdf?index=true
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_c9effd5baf574424bc33ce89a2debef4.pdf?index=true
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_66f436a1ed45431aaefd302336cf29d5.pdf?index=true
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_1eb6052611104d29b80d5634fd2c8f94.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_27038747dff34a2084c878861d721013.pdf?index=true
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_e8e3193f68dd4845819cfd6dc4e4fd58.pdf?index=true
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_4c7ecacb5c2f44c68024318d514fc9f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7cd1732-caea-4832-9900-d9e1fab069be/boxefawakig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d6.bin
c2c943c70e53e33e97ec1f8cc4354cf49a0c55f12db9d4ef3d87ea20b8773b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 5084 bytes
font_01_sfnt_off00011620.bin
5ff48c8735df81738723f6311c41d88af82620fe7da303898cba3530f542a7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 11200 bytes
font_02_sfnt_off00013c72.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.