Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb259e8539884c7…

MALICIOUS

PDF

74.8 KB Created: 2021-02-14 22:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c320c4d205584cd1b699474a4b6e5ffc SHA-1: 3f7198bfdf67a79a4ef0bed368fa51750a3575cd SHA-256: abb259e8539884c7793ae14cfa4ac4f3aa0719130a5b6fd5e2b6c6778642cfda
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=acid+base+reaction+worksheet In PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/pedinagalisikupivet.pdfIn PDF document text
    • http://avtovishki-msk.ru/roller_coaster_arcade_ride_meaning3p5uz.pdfIn PDF document text
    • http://lujuvudav.22web.org/virgin_mobile_answer_machine_number.pdfIn PDF document text
    • http://relofol.iblogger.org/saaho_movie_bad_boy_mp4_song.pdfIn PDF document text
    • http://pimolala.22web.org/tikapamonewurol.pdfIn PDF document text
    • http://20970907.net/big_winds_used_gearqkg43.pdfIn PDF document text
    • http://stepka2016.xyz/word_connect_answers_level_508fwnll.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/jepaduni.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/tenuzasibut.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/xijilesuzuxo/mefebaxurepazakup.pdfIn PDF document text
    • http://guxodolabisiruj.epizy.com/iphone_alarm_ringtone_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/xejilijubimibegonuxopuruv.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/vuvububona.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/feel_verb_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/reading_plus_answers_a_secret_passage.pdfIn PDF document text
    • http://dutugege.epizy.com/64430981980.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/52438604049.pdfIn PDF document text
    • http://sudatidi.epizy.com/aprender_a_tocar_guitarra_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/mcafee_antivirus_for_pc_2017.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 5068 bytes
SHA-256: 2040a38f956e2dc9bb9fe50f59a3c4c04113c7304b642f61107d64c7f469dd51
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10344 bytes
SHA-256: d91b4676247fa392c2c3b49bc430c37a86e5c2438ac5a92fcd079f6aeefdc103
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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