PDF malware analysis — malicious · b7d4f309824f8d21

MALICIOUS

PDF

81.2 KB Created: 2021-02-20 08:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: cd1960e230cad164f0750a1375e12ab9 SHA-1: aa966f6bf7f3c69c6c1c9cbd21b388056f779186 SHA-256: b7d4f309824f8d2152750bec6eb77ae0bef164bc264a04ff4d9a2e877d069ca9

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The embedded URLs and the PDF structure suggest an attempt to drive traffic to malicious sites, potentially for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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.
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.
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://jottigo.ru/123?utm_term=vivofit+jr+2 PDF link annotation
- http://ch-redirect.icu/61762280467ybgdx.pdfIn PDF document text
- https://cdn.sqhk.co/vamunidibu/utjcGji/daily_planner_habit_tracker_goal_organizer_gtd.pdfIn PDF document text
- https://cdn.sqhk.co/fadanade/hdibiic/crime_mysteries_find_objects_match_3_puzzle.pdfIn PDF document text
- http://vnatural.space/lebugotamerigodizuzojmc1h1.pdfIn PDF document text
- https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/deboraxelutovitaro.pdfIn PDF document text
- https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/fodaporixonow-sokifirat.pdfIn PDF document text
- http://raifaisentgo.online/21239039711tfo76.pdfIn PDF document text
- http://bbcua.site/brick_breaker_deluxe_androidixiry.pdfIn PDF document text
- https://cdn.sqhk.co/vuveleni/OA9jajf/bugs_bunny_no_picture.pdfIn PDF document text
- https://cdn.sqhk.co/mowanideju/5soKpij/best_photo_collage_software_for_pc.pdfIn PDF document text
- https://cdn.sqhk.co/soxuxopova/SJjajc6/little_boy_haircuts_longer_on_top.pdfIn PDF document text
- http://www.opentle.orgIn 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/xisefowu/fl_studio_android_old_version.pdfIn PDF document text
- https://s3.amazonaws.com/zesotat/hotel_voramar_formentera_spain.pdfIn PDF document text
- https://s3.amazonaws.com/folexapurilowe/88789444540.pdfIn PDF document text
- https://s3.amazonaws.com/gomaxod/wubulofutidesajuro.pdfIn PDF document text
- https://s3.amazonaws.com/waxegatulo/bal_brahmachari_movie_mp4.pdfIn PDF document text
- https://s3.amazonaws.com/wiwuxot/8265391074.pdfIn PDF document text
- https://s3.amazonaws.com/xasovewipeje/ps2_games_for_ps2.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000e195.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE195	11252 bytes
SHA-256: `210cfd4ce2902bd115e70a9befdf6526e4ac7b7f9c8af6cc81e9f9487e9ebda7`
`font_00_sfnt_off0000d37e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD37E	4136 bytes
SHA-256: `d69084990b41e305295b452acdf4d9a719f80e8479be6b2a1bcc81f356f5bc48`
`font_02_sfnt_off000101b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101B3	11948 bytes
SHA-256: `bb75dc3bf742773ae3b57153b5dfd129f6fbad0817cbcea5293c0e240a25ac67`
`font_03_sfnt_off00012997.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12997	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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