PDF malware analysis — malicious · 66d674482649e4af

MALICIOUS

PDF

92.6 KB Created: 2021-05-23 01:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: cabb7b5834b6e52fa298c1e4ed319207 SHA-1: 218cd717c7459a6b6b2b193079e982613e1c37cd SHA-256: 66d674482649e4afb689cba841f69dc60f45182b02a8812114444f55eccf07e8

216 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains a large number of external links, many of which are benign, but one critical heuristic identified a brand-impersonation credential phishing lure for Amazon. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in PDF exploits to facilitate malicious redirects or payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/7ec001d96b.pdf.
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://baarspo.ru/strik?utm_term=octavia+butler+dawn+characters PDF link annotation
- https://static.s123-cdn-static.com/uploads/4369152/normal_6007fd4b46940.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480744/normal_606ac2d65d8d4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370525/normal_5fe677091d2b6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417030/normal_6007c512b3f9e.pdfIn PDF document text
- https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/7ec001d96b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454547/normal_5fda90cc5a540.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4529024/normal_6008ee9c29a02.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4463532/normal_6008542b469c7.pdfIn PDF document text
- https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/somidavawewun-puforew-nibepojeb-jemoxage.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/3e93230d-8612-4e5d-914c-cdda3ba407a0/vintage_boy_scout_handbook.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4d03dbff-5120-4da4-9222-3840e8d28d7b/how_to_lighten_a_dark_room_without_painting.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/930d843f-d0d9-4ef8-99a2-40e74ddeab64/american_red_cross_blood_drive_volunteer.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c7233372-a290-47b3-81f2-9460d1ae0727/65153102251.pdfIn PDF document text
- https://s3.amazonaws.com/jalasilunaz/28963838960.pdfIn PDF document text
- https://s3.amazonaws.com/norozovijalu/the_day_after_roswell_audiobook_free_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/22a281a7-1764-40fc-804e-5d81e0f5a25e/how_to_use_casio_rangeman.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/584a3f7a-692e-4906-865d-366d863f13ae/longman_dictionary_of_contemporary_english_apk.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1b27a1f4-c15b-4cb2-b66b-16de0ed3789e/dell_v313w_printer_user_guide.pdfIn PDF document text
- https://s3.amazonaws.com/gofilafixu/guess_my_age_math_worksheet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/72e8d488-a1ad-4679-ac23-21f450617cb1/what_is_the_best_form_builder_for_wordpress.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00012eb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EB2	5348 bytes
SHA-256: `206ad846a97c3b216a9024103089ca93856105a97e8aad65baa71c6f55427a26`
`font_01_sfnt_off000140e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140E2	10180 bytes
SHA-256: `cf721777ffcfbf36a9c6362df829adcd84c80aaa7479b5a1cc7ba5a93b6b37cb`

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