Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1c70fd87b8c9c2…

MALICIOUS

PDF

104.8 KB Created: 2021-03-25 19:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ca4b5969e3ae6f0a8926079f94cb67 SHA-1: 23c8cbf9fd181ed02d2dc529fcc9bc38834a39d9 SHA-256: 4d1c70fd87b8c9c2ec898f7961a31c95bc949018f1cf0548d8b3e9da1bed5de0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=bhakta+prahlada+telugu+full+movie+free
    • https://zefisazivite.weebly.com/uploads/1/3/5/3/135314851/3ee0e4e8b1e6.pdf
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/3356614.pdf
    • http://igcopyrightverify.com/84605419421pw5li.pdf
    • http://shlifovka-pol.website/sig_p938_reliability_issuessq3yy.pdf
    • http://pesale.pro/74091854085g8tx1.pdf
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/2077faa0f580e1.pdf
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/wokilumukokavorupi.pdf
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/wesise_noluvo_bapedazoz.pdf
    • http://vzruvayarttraff.xyz/where_can_i_buy_panasonic_batterieswi62y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/wazotojemov/32454285499.pdf
    • https://uploads.strikinglycdn.com/files/52e39328-c73f-44fd-a330-8f2d84410062/71733550808.pdf
    • https://s3.amazonaws.com/bokelur/ios_13_testflight_crash_report.pdf
    • https://uploads.strikinglycdn.com/files/78e40917-28c2-47c2-a756-13f08732e556/vexerel.pdf
    • https://s3.amazonaws.com/sefipa/nedefadapaxelubediv.pdf
    • https://uploads.strikinglycdn.com/files/9d04bb81-accc-4599-84bf-85a52a1f2450/54593528869.pdf
    • https://uploads.strikinglycdn.com/files/5c3ec90c-6571-44e0-8e8d-6f59c673fe4b/55079485205.pdf
    • http://xomutojekes.myartsonline.com/ontology_epistemology_and_axiology.pdf
    • https://s3.amazonaws.com/nefunupu/96524303902.pdf
    • https://uploads.strikinglycdn.com/files/b9852933-ccbe-4651-adbd-f17c73a1d1fe/jam_wireless_speaker_stopped_working.pdf
    • http://kuwitabetegipo.myartsonline.com/mahalaxmi_calendar_2020_marathi_download.pdf
    • https://s3.amazonaws.com/falufusu/adverse_drug_reaction_book.pdf
    • https://uploads.strikinglycdn.com/files/7bf22158-bc15-4f67-a0be-fbe576f0d919/92210259300.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d4.bin
828a4df70ebbc9a60c47dbd3ecdd4f19bf5221f23a05bf475145abfa5cedf7f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 5448 bytes
font_01_sfnt_off00012b40.bin
fd4982411db986d23c7781edb17155d6f71c247c103e09b8d8d9d11bba394aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 3424 bytes
font_02_sfnt_off00013830.bin
fb99e2428b1ef88f75e7e72e02f09b488f35195838ba74ced1b83bf72e18ccf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 2600 bytes
font_03_sfnt_off0001435d.bin
de8b2de0e841e3e0e6d20fb9d465091ace705fc904dbe8fd8539879cb3db4808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1435D 10576 bytes
font_04_sfnt_off00016106.bin
88dc73ec7d02f7822c3ff4a2bdc7bf9ba4f9e39c609f7b83f93799530d4887e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16106 11604 bytes
font_05_sfnt_off00018759.bin
2a5cfac3287ff705917515951cf675c7a11a27e6fad71e6566a366af0dd38180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18759 3200 bytes

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