Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660b45d82548b3d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-10 02:14:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a32be6eb3fdf50d110a0308356bfc157 SHA-1: 6231862a2714c100c143cc86e221704bd0a477bd SHA-256: 3660b45d82548b3d26837d5407c7e877f1562fef8cf100960955f0dc96a65712
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=data+structures+and+algorithms+pdf+by+mark+allen+weiss In PDF document text
    • http://idealica-co.site/6878677198094zgw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5ff8494c479b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_600beffa72840.pdfIn PDF document text
    • http://avto-document.site/hamilton_beach_coffee_maker_49980z_partsybdda.pdfIn PDF document text
    • http://igcopyrightclient.com/zefiba2nt8.pdfIn PDF document text
    • http://creditscorehelp.info/navy_federal_army_pay_dates_2020jnz3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_600993abb5f62.pdfIn PDF document text
    • http://damvglaz6.xyz/60973914523vn2m.pdfIn PDF document text
    • http://xeeewq.xyz/cryptark_ps4_trophy_guideq4h1s.pdfIn PDF document text
    • http://optamorem.com/79362499817s95tb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6020402242757.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/15613493853j8anc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_601bb9b06c427.pdfIn PDF document text
    • http://firstdoctor.xyz/sodexajekeluloo1qzm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nadurajamewe.epizy.com/empirical_rule_khan_academy_answers.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/animator_s_survival_kit_expanded.pdfIn PDF document text
    • http://molodetagako.epizy.com/the_5th_wave_final.pdfIn PDF document text
    • http://jarewixefokoxem.epizy.com/lazodezilupexosudora.pdfIn PDF document text
    • http://mogerokefo.epizy.com/88569623998.pdfIn PDF document text
    • http://vikimoronunez.epizy.com/6186144417.pdfIn PDF document text
    • http://rarasim.epizy.com/86097503835.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/an_inspector_calls_key_quotes.pdfIn PDF document text
    • http://tuxexagixib.rf.gd/65192454574.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5848 bytes
SHA-256: fe4d992ba8d7d1f4d89f4a8118043d00ddd6a00256382fa907cf490c9fba4e5f
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10672 bytes
SHA-256: 76951c521e2e9616d27eb5288d4bbd02162ea1a8ca13c0f94d624ac74e2239b0
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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