Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a8cdead50ead2f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3268eb24e5e6e9f6e8e55445b837afc8 SHA-1: 7b6add9919ef2b8106d19cbe7d7a68c403386511 SHA-256: f1a8cdead50ead2ffd51cf054157484649ceed5bb89cd0095158a190a3a6e19e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'https://jacksth.ru/strik'. This URL is suspicious and likely leads to a malicious site. The presence of a PDF link farm heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=lenovo+yoga+500-14ibd+memory+upgrade PDF link annotation
    • http://jusuzabajalaz.22web.org/ruvotazokogifezero.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/787d6b0ad.pdfIn PDF document text
    • http://ximikilanad.22web.org/dovojopedukuxuladejani.pdfIn PDF document text
    • http://nusaxotu.22web.org/bleeding_love_piano.pdfIn PDF document text
    • https://vezaxudikofexi.weebly.com/uploads/1/3/4/6/134654587/puvinopigumiv.pdfIn PDF document text
    • https://zenibevakuziva.weebly.com/uploads/1/3/0/7/130739170/a18cbd4b87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/how_to_learn_coding_for_free_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/how_do_i_use_my_small_aroma_rice_cooker.pdfIn PDF document text
    • http://sumoxajavagal.rf.gd/6832252489.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/how_to_store_a_lawn_mower_battery.pdfIn PDF document text
    • http://kowexefuwuron.rf.gd/woc_pneumonia_pada_anak.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/3079843941.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/reportable_fbt_gross_up_rate_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/largo_winch_tv_series_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/bigewemewinefexejosaxod.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/magic_mouse_2_space_gray_refurbished.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/essentials_of_statistics_for_the_behavioral_sciences_10th_edition.pdfIn PDF document text
    • http://nixikivike.epizy.com/gowevinuxunuwi.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/although_in_spite_of_despite_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/sig_sauer_p320_iwb_holster.pdfIn PDF document text
    • http://nelevevupa.rf.gd/ryobi_scroll_saw_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/28720770271.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/cushaw_squash_nutrition_information.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 5552 bytes
SHA-256: c8b7fa6ff4e779bb2e108898003060bd1f174b59a0e61a87e327b1863ee19b91
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 11000 bytes
SHA-256: bee897507115d6b4824250451470643d3846ad09e85601af949fce7561fa70d6
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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