Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c6773109c94fa9…

MALICIOUS

PDF

77.1 KB Created: 2021-04-10 20:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5dc36292a5598b5b6316bf510fc3c10b SHA-1: 2543d53bdf0d2e8e483cbd30b167cdeb72f9419e SHA-256: a8c6773109c94fa9fbe027193a786b1b300fd942ed8212b84e6ae2ecb3f12bd8
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a primary URL pointing to a website related to weight loss, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+reduce+weight+and+flat+tummy PDF link annotation
    • http://nedipupuru.22web.org/attic_greek_grammar.pdfIn PDF document text
    • http://wazinufezil.iblogger.org/bisuzebudabirexuri.pdfIn PDF document text
    • http://tinuliv.22web.org/potential_difference_between_two_parallel_plate_capacitors.pdfIn PDF document text
    • http://bidibuxodad.22web.org/apocryphon_of_john.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/91101921204edlsv.pdfIn PDF document text
    • http://mexicotop.xyz/suggestion_box_form_word_template8ubzs.pdfIn PDF document text
    • http://fetokoporumof.22web.org/neuron_structure_worksheet.pdfIn PDF document text
    • http://solavopuna.22web.org/wowhead_jaina_mythic_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suximawo/zasitiloropup.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_371ec13434dd4178ab84eb15464ce518.pdf?index=trueIn PDF document text
    • http://zobawukesilebaf.epizy.com/ipso_facto_reforms_1_july_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/noridagev.pdfIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_c6ad014329c943f988dbe6ff940db67f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/dunufogegiguxutetitelizon.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_1cfbb79496cb452cad3569402d72bdc0.pdf?index=trueIn PDF document text
    • http://sewoxoxitif.rf.gd/14013138800.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_373e12f41c6144959095aa38eacd981d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/6.0_diesel_replacement_turbo.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/89280234933.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_bd44fea16e9f46a4adf7ca4f979ba001.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_966596433c0544ab97bac2a31ca33ca9.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5412 bytes
SHA-256: 30c44276acf159cbca5ad8a809d9db27e872fd9f1637f98950fd543c0447db41
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 11048 bytes
SHA-256: 6fe5379222e590c503da6d44a25f989adcb2418e0a2201457f93713a73f14322

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