Malicious PDF — malware analysis report

Static analysis result for SHA-256 a253d94f1522d1b5…

MALICIOUS

PDF

70.8 KB Created: 2021-03-24 19:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 635f46060217c0eff3e7fc281895c7ef SHA-1: 74b136e5a0f7b68f61759b5a98cd29eb995acc29 SHA-256: a253d94f1522d1b5d191fbec6a619facd0886c969a512ed8582d299537cf8971
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=pressure+practice+problems+worksheet PDF link annotation
    • https://paxudusumumo.weebly.com/uploads/1/3/4/3/134312151/vevomozuzewi.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/kawuroxugukezo.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/2231058.pdfIn PDF document text
    • http://shlifovka-pol.website/76369486057rca5y.pdfIn PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/nupazin.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/d74489425.pdfIn PDF document text
    • http://lujotagefizoga.iblogger.org/operational_risk_assessment_template_xls.pdfIn PDF document text
    • https://bufotikebejunut.weebly.com/uploads/1/3/1/3/131398235/8c0b7f276.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/tuwexape-kipuxupub-zexetokafuvukem-mepelejada.pdfIn PDF document text
    • http://bilet-pdd.site/lemokupominosrwcu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e595b3-eb21-4713-9740-19d26078eb5a/gixigusilelasanatuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5aa95e-e508-4a1f-9c0f-f1a35397a2ff/how_fast_does_a_polaris_400_sportsman_go.pdfIn PDF document text
    • http://logiratawune.rf.gd/look_back_in_anger_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159c88a7-2b9f-4f01-82ca-bf124950065f/sanizufudon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5321272-6d0d-4382-9d34-c1357a3e1bbd/what_is_the_difference_between_data_mart_and_data_lake.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/thomas_calculus_1_trke_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9fda6c-d6d2-44eb-9b07-6118ad35e0b0/lemony_snicket_a_series_of_unfortunate_events_books_set.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/camila_cabello_shawn_mendes_song.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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 5468 bytes
SHA-256: 5a16b19c4965013ce84865717c018d190b04c7c11b0ed5446f3514b891c5a0b6
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 11116 bytes
SHA-256: 476dda1c9b9b4a0499268dad67cdda998742eafc2716ff7bdf83727b04dd070a

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