Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ce11bef96609bb…

MALICIOUS

PDF

68.5 KB Created: 2020-12-15 12:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 947429ecb46954fc07c5ec67157811ba SHA-1: 57237b59b364af8c8f2a65e7da419869eed9d235 SHA-256: 39ce11bef96609bbdb7875660650c1898795b1233c37191a29cf0a260cd19634
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=us+history+eoc+assessment+practice+test+answers
    • https://gudimutukadido.weebly.com/uploads/1/3/4/6/134648046/tadidokami.pdf
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/zoxifof.pdf
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/1fffab1576fd30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e913affbf90a66ea8572/t/5fc73b46b7521d608a420f27/1606892359368/best_video_player_app_android.pdf
    • https://static1.squarespace.com/static/5fcee9f2cd9942793f246970/t/5fd65ce013a48350e8118066/1607884001019/bibb_county_superior_court_forms.pdf
    • https://s3.amazonaws.com/pomaxa/2987535586.pdf
    • https://static1.squarespace.com/static/5fc569f58139af037663613e/t/5fccbb5c920f47545b909e93/1607252829385/79636138363.pdf
    • https://static1.squarespace.com/static/5fc002e7e5c7695ca996b6a8/t/5fc9e4b641142a3c4b415801/1607066809917/disney_world_interesting_things_to_do.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf5e3eaf37e3b64614d0c/1606284772362/jekipalanexejas.pdf
    • https://static1.squarespace.com/static/5fc5135716f6d44b07d97325/t/5fccb56ec00f007ceae4880e/1607251316460/tavuvemosudafivov.pdf
    • https://static1.squarespace.com/static/5fc2b45ca87939686413d8d4/t/5fc75ddb48d5672cfb3dd40d/1606901214444/33952978942.pdf
    • https://static1.squarespace.com/static/5fc1d0d6bd14ff0dd2a325bf/t/5fcd08e2d235d37878c9f63c/1607272675550/grand_china_denver_phone_number.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a371972c46e3c94df97/1606371895987/toys_r_us_breast_pumps.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_off0000d28b.bin
b5b5fc71ee795f17cbf047e604705b42e79587c893c3544eb5fe39f53a938ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5324 bytes
font_01_sfnt_off0000e493.bin
54faeb4af48b687aacdf65aa24d1ccb1e339defefc41486de868d9b574a001f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 9548 bytes

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