PDF malware analysis — malicious · 81f2b1c7636ec2d0

MALICIOUS

PDF

86.2 KB Created: 2021-03-28 22:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: da3d74ed3af6996bea350399e7f24fd0 SHA-1: b8e12915dd68f7929e940bcb42735a9322aea797 SHA-256: 81f2b1c7636ec2d0338495ecae3d61e7e0cb052c988df0f4928aa3d3461e2f58

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, with a critical heuristic identifying it as a link farm. One of the embedded URIs, 'https://baarspo.ru/123?utm_term=apk+ram+booster+extreme+pro', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier further indicate malicious intent, suggesting the PDF is used to distribute or redirect users to malware or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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
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://baarspo.ru/123?utm_term=apk+ram+booster+extreme+pro PDF link annotation
- https://cdn.sqhk.co/piwewupovo/ToEgjPV/maze_runner_book_4_summary.pdfIn PDF document text
- https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/ketorupafojozirega.pdfIn PDF document text
- https://cdn.sqhk.co/virurewev/Hjh7Sgf/wardrobe_sliding_door_systems_uk.pdfIn PDF document text
- https://cdn.sqhk.co/jivazufevi/jd3ggod/the_hangover_movie_baby_carlos_t-_shirt.pdfIn PDF document text
- https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/b0bb43080bf58af.pdfIn PDF document text
- https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/fimovebewedufonaxeko.pdfIn PDF document text
- https://linowatudevenur.weebly.com/uploads/1/3/4/5/134599813/ec6f5ef4.pdfIn PDF document text
- https://cdn.sqhk.co/nigezufi/NnBgcFJ/dream_league_soccer_2020_mobile_download.pdfIn PDF document text
- https://savibivo.weebly.com/uploads/1/3/1/3/131381036/7737792.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- https://s3.amazonaws.com/bewibiwat/grigori_grabovoi_numbers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fc0c7bfa-6b54-41c4-9ac8-a9adbdc1cbdb/kimujigo.pdfIn PDF document text
- https://s3.amazonaws.com/zabevog/latest_avg_antivirus_free_for_pc.pdfIn PDF document text
- https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_be3939823d8348c99dd35ca324b1b8e5.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/piwanisaj/ozarks_imdb_parents_guide.pdfIn PDF document text
- https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_3ff1b225e52345c794c405795b0682d0.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/webipejonavuv/abs_diet_workout_plan.pdfIn PDF document text
- https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_1b958ef5a2004f4790199ae76eb1164d.pdf?index=trueIn PDF document text
- https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_2bca608e893d47fe8b6de4128419d64b.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b23f88a0-aced-45da-aacb-36b1452a2e0a/sawedejofi.pdfIn PDF document text
- https://s3.amazonaws.com/fujadabez/fesapexanibeselin.pdfIn PDF document text
- https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_c31e3f9d67fa4a94b91809bd0aa86897.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_off0000f035.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF035	5196 bytes
SHA-256: `f7382b2e8a234b42eb7c274da28c5e2ae0c3560c12221a3e0bfa6da1afcdbb24`
`font_01_sfnt_off000101c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101C3	10660 bytes
SHA-256: `9e6961f475ea7820f31db17c0600e2728af9abc065fdd769dead11ed282dddca`
`font_02_sfnt_off0001267d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1267D	16192 bytes
SHA-256: `296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57`
`font_03_sfnt_off00013bc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BC7	3524 bytes
SHA-256: `dfc6fc4a01fc5a55af183a9d662c0027b851d66b2df73b171245477e2060a824`

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