Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a3e950c2800bbb…

MALICIOUS

PDF

70.4 KB Created: 2021-03-02 04:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65fcf984cb63534cd78c22aebdae429c SHA-1: 0fe0524fe29242851871e2b641da2e009b558497 SHA-256: 03a3e950c2800bbb0cb847b6cdd9e726d188080b76a9dab8a9b9fff5622fb24c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://jottigo.ru/strik?utm_term=organizational+behavior+an+experiential+approach+8th+edition+free+pdf PDF link annotation
    • http://makedctl.site/rakabuvorugiol046.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/idXjfii/push_and_pop_array_javascript.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/2Fubjdb/sword_maker_game_cool_math.pdfIn PDF document text
    • http://zesamoa.online/17833299349a8tfi.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hcjjiir/morningsave_deals_extra.pdfIn PDF document text
    • https://cdn.sqhk.co/xamubana/jhhaLgC/42828068952.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/FjboP2L/8665489723.pdfIn PDF document text
    • https://xapotaligefako.weebly.com/uploads/1/3/4/6/134612972/titalikoxebuzedas.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/iajgjh9/97125975675.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/hegi1jj/galaxy_watch_3_vs_active_2_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/iiChchG/make_meeting_makeup.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/kulegozox-pofedepaxawobe.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/giGTjg0/59809842734.pdfIn PDF document text
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/a47b81311fc76.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ghibjiv/97830002736.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/gT5iYpi/zasedibit.pdfIn PDF document text
    • http://baffer-shop.space/gebewovepisevizisozapo26xct.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ii1MjT8/mojajumajenenoforomegute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewajelawukos.rf.gd/7160477944.pdfIn PDF document text
    • http://piloxezerepijaf.rf.gd/31119227592.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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 5780 bytes
SHA-256: 237badc2c7d4ad55124af4aaa6df8d61ec9bfda18ec734db96776fba46d9801a
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 11388 bytes
SHA-256: b7b5699b40d127938434d8793229c1db78eb4f3066db8d6573badbb575a75d44

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