Malicious PDF — malware analysis report

Static analysis result for SHA-256 667090713f443a5e…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 23:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 946fae3b556d3852f3c320f010e6876e SHA-1: 6176f07235a90e9562822e8080e88b986ae8d942 SHA-256: 667090713f443a5e5a6bac5b3081343dae8212c80fc03df9c5f7e27b5a5334ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, suggests a lure related to snowblower repair. The presence of external URIs and a high ML classifier score strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+replace+a+pull+cord+on+a+yard+machine+snowblower PDF link annotation
    • http://jafinipu.scienceontheweb.net/bbc_english_grammar_book.pdfIn PDF document text
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/wigavuzumilo-luwugopekenakub.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/d2479f322d8aebd.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/statement_of_certifying_physician_for_therapeutic_shoes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajapojaperusu.myartsonline.com/musagofiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/43077387741.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_2e80b266903d4c5e96f42e805fb1c590.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_10aeef26fcd64fc0b8177fad07c4ae06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/aunty_number_1_song_pk.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/howards_end_study_guide.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_936d136160224f33b5543a5e31d2e66b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/21065230696.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/65799748181.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/ferdinando_el_toro_cuento_corto.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_45b7903cf6564f7f831e573ad6e7bd5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ximupuv/gekofe.pdfIn PDF document text
    • http://wugerubuvugox.myartsonline.com/rilebetexepon.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/belly_the_movie_free.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_8aedf72c393e43fba0b836397f13b790.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5608 bytes
SHA-256: 94691114bf236a96f015aabd06b92c716fdda2da1d7a545499c8ce931a2c4788
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10464 bytes
SHA-256: da360b505baf7994f32b0fd4a2ed5725604504b16b95035be5562ff7f8b586d8

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