PDF malware analysis — malicious · 8a1ceb8107f358b3

MALICIOUS

PDF

92.6 KB Created: 2021-03-30 10:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: a887081a769b362d3026603a86b221d4 SHA-1: 26c9e626171b7fa9b219f3e6f06cd96f0dfc53dc SHA-256: 8a1ceb8107f358b397d4ff7829a21656d3ddfe5252e2a135dbc0fffc70c19c3e

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to product specifications, which is a common tactic for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://dafemum.ru/strik?utm_term=hypertherm+powermax+30+specifications In PDF document text
- http://vannabanyavsedela.xyz/how_to_sub_to_someone_on_twitch_prime3h2xk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481420/normal_6047bdaf5d787.pdfIn PDF document text
- http://zunololanuxigu.sportsontheweb.net/lamawot.pdfIn PDF document text
- http://instapodarok365.site/73172337426o4b8s.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480753/normal_60161c0aba93b.pdfIn PDF document text
- http://zozavelomidabi.scienceontheweb.net/simageliwowarolemuv.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459780/normal_5ffd1533493c6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4472481/normal_60090e3832986.pdfIn PDF document text
- http://znakomstva69.space/pofonifugimefigx770.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367645/normal_601487f52e058.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482230/normal_5fd8df5b048a3.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://uploads.strikinglycdn.com/files/86d8ff62-7a44-4638-ac86-1e48b8216372/dell_24_ultra_hd_4k_monitor_p2415q_specs.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1f8e92c0-c18c-48c7-bcfc-f6320a1cbd0a/volipem.pdfIn PDF document text
- https://s3.amazonaws.com/donarepemi/valafefogenexekerobezewoj.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5d31bf7f-ac3c-4c62-98d6-f228b6430d1c/how_long_does_a_booster_pack_take_to_charge.pdfIn PDF document text
- https://s3.amazonaws.com/jamuluvuvava/skype_messenger_filehippo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/da9637c3-5910-4128-b0fc-aea097e1104b/zurofolotawu.pdfIn PDF document text
- https://s3.amazonaws.com/posufij/seven_little_words_daily_answers_sept_14.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_off000106ee.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x106EE	13304 bytes
SHA-256: `6ca7e777d9d4d130f3bcdcdc073d9eba3f850f6a7fd2c34d9b12ccf46641b26f`
`font_00_sfnt_off0000f433.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF433	5540 bytes
SHA-256: `386805ca6cd8db88b1ace963318544ac15ead9f5bd98da45310efa0f334bfe8d`
`font_02_sfnt_off00012cdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CDB	12028 bytes
SHA-256: `eece20a14f7c28152bbb70afa80deafc87becc55897f134f359582cff6f0c65c`
`font_03_sfnt_off0001552f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1552F	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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