Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72b6655c7f0897…

MALICIOUS

PDF

93.5 KB Created: 2021-03-24 05:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e45a325c78ff01b9925b9f49f9d1e5f7 SHA-1: 933c49a75fab77d019f2c375141581512e6c65b4 SHA-256: af72b6655c7f0897229b0e95cf75392fd2fa4db803b9c4bac99d45c2e767b299
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents or login pages, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and external links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ponafet.ru/award?keyword=blocs+wave+manual+pdf
    • https://cdn.sqhk.co/woteruzid/4jhhagd/paypal_account_login_canada.pdf
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/2880762.pdf
    • https://cdn.sqhk.co/juxezijafoz/jdzMji8/daily_planner_2020-_21_uk.pdf
    • https://cdn.sqhk.co/ruwonumatag/dsjikKX/80267449745.pdf
    • http://nowukusox.mypressonline.com/98665530275.pdf
    • http://poxumanavofeboz.scienceontheweb.net/11826842041.pdf
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/2f9ec77536.pdf
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/bf17872b1.pdf
    • https://cdn.sqhk.co/zanotunuzi/d56ibha/31740408061.pdf
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/5456464.pdf
    • https://cdn.sqhk.co/filumabit/ggjiia8/zovesevugirenojupo.pdf
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/kexuzofu_riwimonerako_pidasagereraz_jidezujavasituf.pdf
    • http://kojazunupetip.mygamesonline.org/att_digital_answering_system_dect_6.0_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zunewidimem/jejezutugibutifebivagef.pdf
    • https://uploads.strikinglycdn.com/files/9788b992-890a-4c8d-98f9-8819e7ee77d3/what_does_light_absorb_mean.pdf
    • https://s3.amazonaws.com/mejawiwomak/limiseko.pdf
    • https://s3.amazonaws.com/silubebebefuju/lirojemovekazas.pdf
    • https://s3.amazonaws.com/liwara/wigoximaf.pdf
    • https://s3.amazonaws.com/xafaxotaful/78860167759.pdf
    • https://s3.amazonaws.com/jewizopukuni/diseases_associated_with_carbohydrate_metabolism.pdf
    • https://s3.amazonaws.com/nafoxuda/clicker_garage_door_keypad_reset_without_enter_button.pdf
    • https://s3.amazonaws.com/wiremeresegikon/zigoxowekozudife.pdf
    • http://pabewuvuxaf.onlinewebshop.net/the_economist_05_may_2020.pdf
    • http://badamowafe.onlinewebshop.net/99629797721.pdf
    • https://uploads.strikinglycdn.com/files/69156ac9-ae9e-47c6-a898-b526da33642d/is_there_a_movie_to_the_summer_i_turned_pretty.pdf
    • https://s3.amazonaws.com/wupixufekijax/nekogonasawikado.pdf
    • https://uploads.strikinglycdn.com/files/83bca62d-c8ec-45e4-b8fc-4f4b78f209e0/56366378238.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/invoice_form_template_html.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_off00012a6d.bin
b7d8359e7a7437127380cc9e00d81866cbc1e27e9ffcf0e0f2d9ff071099a352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 5408 bytes
font_01_sfnt_off00013ce1.bin
b85f3f126d6d7fa9c57793938ec3f9ef13db557d8b9201c86b6603e14c585ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 13192 bytes

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