Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbac44f49f6107b3…

MALICIOUS

PDF

75.0 KB Created: 2021-02-19 08:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5404744e18146de21889a9b345b8cb1a SHA-1: 6b3f2f383d7e4b035a7bf4131529f35a421365a2 SHA-256: fbac44f49f6107b309c1576a1c7b2c9b3147c2efab4a7d28de1820ad189edccf
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDFs hosted on disposable domains, a common tactic for SEO link farms or distributing malicious content. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is classified as a link farm. ClamAV also detected it as Pdf.Phishing.Trojan.

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
  • 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 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.
  • 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/aws?utm_term=map+of+maycomb+county+in+to+kill+a+mockingbird+with+quotes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fdfb7d8c2157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_6026d4c71e22a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fcbff0f0f43e.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/ximalajowujovo-butodobe-bomabigovalawag.pdfIn PDF document text
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/lurusumuvepame_xudum_goxirew_kuwobu.pdfIn PDF document text
    • https://cdn.sqhk.co/fovudadeweto/ihJhjEr/noramuzetuxovigolatibin.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/nonimu_nalududojejujo_fijede.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/bemiki.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/2250182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601624f3ba43d.pdfIn PDF document text
    • http://thailandlove.site/670878332854hwyd.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/eghhhie/600_to_800_words_is_how_many_pages.pdfIn PDF document text
    • http://udilische.club/baba_ambedkar_movie5w2sl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fdd5bb169b5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fec35621d148.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
    • https://s3.amazonaws.com/redegelesibif/rozujogeliduluvafer.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/types_of_attachment_styles.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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 5980 bytes
SHA-256: ab0341b540a140bfa327aca43310b43046ebaba631c7bf0b48aa153427157fa5
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10716 bytes
SHA-256: 6029aad519834d09520268aff32a006ff00b0833ad104ab68c746d1e5abdb781
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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