Malicious PDF — malware analysis report

Static analysis result for SHA-256 3175591ba5e79001…

MALICIOUS

PDF

103.1 KB Created: 2021-03-06 07:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 858305e41be521817159e0c8e7a7d154 SHA-1: e87541b0bb77c94494690ba6ab89643474666612 SHA-256: 3175591ba5e790013293dddf3022ca523b47f756451401cd6b9936fb23a38b0f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=eastern+hancock+high+school+football PDF link annotation
    • https://cdn.sqhk.co/rarukaboz/ibWsicM/cannondale_xc_race_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/h6XVhdh/last_day_battleground_survival_v2_mod_apk.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/13026062545.pdfIn PDF document text
    • https://cdn.sqhk.co/rojawamusula/DjeDjar/mowilufu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/7oGicqr/virus_software_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/hxhaWoi/real_boxing_2_rocky_apk_mod_download.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/4847911.pdfIn PDF document text
    • https://welafunugor.weebly.com/uploads/1/3/5/3/135327357/birikute_ligeziw_nagiluger_kikovuxusob.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/foxemedojog.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/2Agjvja/rayman_jungle_run_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/cggjgj2/makeup_nails_and_hairstyle.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/ibflNie/16871064178.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/kufok.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/woY0Qif/mufenuripaxaxafaruwatalal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/safety_1st_onboard_35_lt_infant_car_seat_compatible_stroller.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/24385741693.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/recherche_alternance_informatique_montpellier.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/88428920227.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/aalala_kanda_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/61026421379.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/mrs_funnybones_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15742 5304 bytes
SHA-256: 818143041218c873dd76d99c7d26174f01c32ac4f9efeee02d5b6430e9c92b5c
font_01_sfnt_off0001694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694F 11152 bytes
SHA-256: 1d1bcccbc06722c4cdbe3688d9d4815d13a95ec1eefcead6c8ccee59eca3cabc

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