PDF malware analysis — malicious · 3593e031c6b693a3

MALICIOUS

PDF

94.0 KB Created: 2021-04-21 17:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: cbb6b9f52f1fda5fc7e047365d526cda SHA-1: 5d3a5e458cdca472bcd3b0bf7cfee01be0503654 SHA-256: 3593e031c6b693a3bb2b2471409aada553668c4d67b3a0e74883f55e2bc509e6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware delivery attempt. The embedded URLs, particularly the one pointing to 'nipisod.ru', suggest a redirection to malicious content, likely to trick users into downloading further malware or divulging sensitive information. The PDF structure and embedded links are consistent with a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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 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://nipisod.ru/strik?utm_term=calculus+james+stewart+solutions+manual+pdf PDF link annotation
- http://namelesssouth.xyz/vubalux21b7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422377/normal_602ca2c25f347.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467593/normal_6043f98cf091e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474206/normal_60185c2044d72.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481423/normal_6022e6c2d3446.pdfIn PDF document text
- http://cetop.xyz/xajojelijipedidugegivamthfb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379487/normal_602f8560b331a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4407664/normal_5fc7ff8763199.pdfIn PDF document text
- http://vowalokitekile.22web.org/fajuviwiku.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407552/normal_60355bc87cf51.pdfIn 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://uploads.strikinglycdn.com/files/c382b338-a2da-4dc3-9a87-e96a01c7f26e/buy_traktor_s4_second_hand_stores.pdfIn PDF document text
- https://s3.amazonaws.com/jokotaziweluge/crowley_tarot_gold_edition.pdfIn PDF document text
- http://zorogeloma.epizy.com/clown_knife_fish_care_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/fulazelof/the_maze_runner_book_plot.pdfIn PDF document text
- https://s3.amazonaws.com/jijumupade/nugojebigiboforizotemeb.pdfIn PDF document text
- http://zifasodokid.epizy.com/international_airline_codes_list.pdfIn PDF document text
- https://s3.amazonaws.com/woxewiwupir/benisa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0277a41d-850e-436a-a31a-d3a14b116248/fovasawutunejawepelejexol.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8a048c9a-de80-46dd-95d0-480f4f513bc0/why_does_my_ryobi_mower_keep_stalling.pdfIn PDF document text
- https://s3.amazonaws.com/wufujudisu/breville_smart_oven_air_with_super_convection_reviews.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3e51469a-d825-49c8-aaee-c8076e28d50c/ripadafudepizofebonufeno.pdfIn PDF document text
- http://ladekaserum.epizy.com/apa_citation_style_guide.pdfIn PDF document text
- http://xesijapapun.rf.gd/9978617411.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011fc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FC5	5376 bytes
SHA-256: `8125ae2000bd99b79c0cdccb548d80c46681337dc51d96050a50a762e9599e23`
`font_01_sfnt_off00013208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13208	11996 bytes
SHA-256: `3f419aa6e882c2f8cbedaa220a2ea0feee72f5bd7326d8a44d96f79ba34f5bd4`
`font_02_sfnt_off00015995.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15995	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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