PDF malware analysis — malicious · 5da94c65049519dc

MALICIOUS

PDF

72.8 KB Created: 2021-05-24 20:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 2791ab9b0278708df08fdadd42d47967 SHA-1: b78c4eb0be682064529990c9131a2488275c0133 SHA-256: 5da94c65049519dc8e284b4ab2b7af96329d8ebb257d4a52b487f8bd4b58b80d

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO abuse tactic. The primary lure appears to be a 'coloring workbook answers' theme, likely a phishing or scam pretext to encourage downloads. No scripts were extracted, but the presence of numerous external links suggests the PDF's primary function is to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://pelibifir.ru/strik?utm_term=axial+skeleton+coloring+workbook+answers PDF link annotation
- https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/5320147.pdfIn PDF document text
- https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/b8f2b.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/bezegoluzose/89886956048.pdfIn PDF document text
- https://s3.amazonaws.com/sinadi/bter_rechecking_form.pdfIn PDF document text
- https://s3.amazonaws.com/jubiferekaka/74656728561.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b83b7e68-30f7-4b6b-9aa8-48c1e402ba8f/sibusanojobuvesiligoxa.pdfIn PDF document text
- https://s3.amazonaws.com/xafaxotaful/95291664292.pdfIn PDF document text
- https://s3.amazonaws.com/vosimalume/44125273127.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9df027db-c36d-4464-8654-4e9f51a8449e/12554611820.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0bf47955-c569-4d3a-8ff7-bd0a8a593727/gulikijupusoxologozipetun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/397824a1-0e12-4c70-8fc3-40e319ae121d/wubovuxipixaturu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/49918a4d-a620-42ed-ae0a-4786a04df4e7/how_to_do_analysis_of_variance_in_excel.pdfIn PDF document text
- https://s3.amazonaws.com/vipinib/dragon_ball_vegeta_vs_android_19.pdfIn PDF document text
- https://s3.amazonaws.com/nuruvapozixix/how_to_service_a_club_car_golf_cart.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e2d71481-6d40-4ff7-85da-0d741cdea449/is_ipod_nano_still_supported.pdfIn PDF document text
- https://s3.amazonaws.com/wiwuxot/fobalidujunukezatut.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/af7a7294-9253-4f0b-9ed2-4b82b73f7a6a/chemical_engineering_lab_report_example.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/51258499-7723-4ca2-b32c-a67eb8b01b08/williams_allegro_88-key_digital_piano_price.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_off0000e24c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE24C	5320 bytes
SHA-256: `eebba90432e6b1c5300e2cecb2fbbbf10c5853aaa4578b84e516e5d5848fa74e`
`font_01_sfnt_off0000f48b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF48B	9928 bytes
SHA-256: `1286715c4436d85bfa3edbeda5076b36c58ee27164c68b8e13acaa1d1622a00a`

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