Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44ff8c6c119dcfa…

MALICIOUS

PDF

84.7 KB Created: 2021-03-17 07:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a9f6fc25daaddb13a152891c698d7f7c SHA-1: b1c558af47ebd9345e35e75436c45ab0888cfd2d SHA-256: b44ff8c6c119dcfa85ecc77c26d9046f35eb753b1592c85005df6b257fb0f901
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm intended to drive traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=how+to+read+a+boxplot+in+spss PDF link annotation
    • http://takovod.66ghz.com/dv_lottery_registration_form_2018.pdfIn PDF document text
    • http://gusanod.22web.org/dapusazejuzanijoli.pdfIn PDF document text
    • http://patimezo.22web.org/sears_craftsman_6-1_8_inch_jointer-planer.pdfIn PDF document text
    • http://jafepakapexi.22web.org/elliptic_curve_cryptography_tutorial.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/99224625-81ce-43e5-8bfc-5d3e6f968e96/panasonic_cordless_phone_manual_dect_6.0.pdfIn PDF document text
    • http://wepuwuzuvam.epizy.com/sustainable_growth_commission_report_scotland.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_04245dc7ac4242528fab6d770a5ca391.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/butivivatudoruramesak.pdfIn PDF document text
    • http://nanaxaj.rf.gd/voneleseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b64184-ef6b-4941-a524-f3a69d6b4e53/robert_adams_obituary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4d1a3b-bbda-4398-b18c-01c53117d758/how_to_get_xbox_live_gold_for_free_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c8c771-9c22-495b-ac22-c24c9956ea4a/jawoji.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_df1fcec96bb043a2abeb0af667a92520.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c485f76a-5737-484e-b89a-02f9a774d6ed/rekisemubofezas.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/31846066652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28488336-3784-4bcb-b14a-d28bbb9b3f61/transition_words_for_good_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef76a48-b825-490c-8e6d-abf7b91d23d9/review_skyworth_tv.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_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 5212 bytes
SHA-256: b2e81319f55e0303dc83aa6e0e3adc1f80cd1c9d40e50a1c5cb700dab548369f
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 10980 bytes
SHA-256: 42b92560e45c6c899c29e316498bcb23de41fb1ad271b06b75e87119cdbccabd

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