PDF malware analysis — malicious · 52fd19bfe87c71b2

MALICIOUS

PDF

110.9 KB Created: 2021-05-16 06:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 6d3419890a6215562e595324fbdd2a4b SHA-1: b049d7efc1c5c05be9f146cc8196a763762b4b0f SHA-256: 52fd19bfe87c71b2733d4b88107104c9045aafd35a7d4b41a6b59719afc97d97

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic suggest the document's primary function is to redirect users to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
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://botokaw.ru/strik?utm_term=how+to+pair+my+lg+soundbar+with+subwoofer PDF link annotation
- https://dowoxadi.weebly.com/uploads/1/3/1/3/131380004/8658887.pdfIn PDF document text
- https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/jijukabuxuz.pdfIn PDF document text
- http://on-arenas.com/mozobipesigoje1kg6.pdfIn PDF document text
- http://subbellassecret.com/tuzuwotefefejebtxidb.pdfIn PDF document text
- http://stopro.store/how_interior_design_can_change_the_world1fsf2.pdfIn PDF document text
- https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/386910.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/libosokune/piguwijofufibejonemebu.pdfIn PDF document text
- https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_b2078b3f649a4a9999d8279217984915.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dowesitobuga/punjab_university_b_tech_admission_form_online.pdfIn PDF document text
- https://s3.amazonaws.com/gorajikunobixi/ethical_hacking_jobs_from_home.pdfIn PDF document text
- https://s3.amazonaws.com/wopari/wetogijuwudo.pdfIn PDF document text
- https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_5a9f8f7af6d34b2289d0f3fbd09e1bd1.pdf?index=trueIn PDF document text
- https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_41ab4fbe178240a78248d8c1a870b542.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xuxifuzituwu/cs221_cheat_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/waxegatulo/incomplete_and_codominant_traits_answers.pdfIn PDF document text
- https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_70d0f1aadefe4839a0f761b4793249d5.pdf?index=trueIn PDF document text
- https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_191008cb36ac45e29d3f46ed05088645.pdf?index=trueIn PDF document text
- https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_912b149d4b7d4eefb8444f990f5dd032.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/fikuvine/sufumosomirozukudasapu.pdfIn PDF document text
- https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_7d1c681e89164f44a6868904f174aaa1.pdf?index=trueIn 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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00013bb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BB0	9152 bytes
SHA-256: `a1741cdbbcb9ae2e764595fc041432971e4d267be5e21cb25514050f9357f838`
`font_01_sfnt_off000159e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x159E0	5748 bytes
SHA-256: `a58b8bd63c8e5cdf6805b1b76360af97ca998cf5df32903247f309eb3eb9a12d`
`font_02_sfnt_off00016d56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D56	12584 bytes
SHA-256: `1adbd0374a6b42b92abefd0ca186c9adab5c82ebc0013bbb524cb3fc85e036fe`
`font_03_sfnt_off000197fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x197FD	16280 bytes
SHA-256: `d85f331ae5e0c113910889ef5aaed653ec464058c0dce6400634ec31320cfdb8`

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