PDF malware analysis — malicious · b4ebb4556a428e82

MALICIOUS

PDF

78.7 KB Created: 2021-03-09 06:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 19880dbb1159e9fdf3f28b1f79fa12cd SHA-1: 897b23f83bc3dd46ccfac1b326becc277c339816 SHA-256: b4ebb4556a428e8286b7b719d907a8549b2f9ae6d1480e491f652227551da72b

184 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. The presence of a large number of external links, including a link farm, suggests an attempt to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata related to PDF generation tools and keywords that might be used in SEO poisoning or phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://kuzutuzo.ru/award?keyword=cetoprofeno+gotas+medley+pdf PDF link annotation
- https://xazopitanajemav.weebly.com/uploads/1/3/4/7/134714933/9740814.pdfIn PDF document text
- https://cdn.sqhk.co/gubuvojubu/bjc7iet/chakravyuh_full_movie_filmywap.pdfIn PDF document text
- https://cdn.sqhk.co/bamazaludez/tlXEhbV/xefiviwolowasodanu.pdfIn PDF document text
- https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/6833230.pdfIn PDF document text
- https://cdn.sqhk.co/vifutetax/SjcwuKp/22550559997.pdfIn PDF document text
- https://kagamufoxigog.weebly.com/uploads/1/3/4/0/134013308/efd9baaf.pdfIn PDF document text
- https://cdn.sqhk.co/wuvinudubuno/bEibiie/2048x1152_screen_resolution.pdfIn PDF document text
- https://cdn.sqhk.co/legesizas/dhht2gi/what_does_spinning_top_mean_in_spanish.pdfIn PDF document text
- https://cdn.sqhk.co/zapimafe/jficwjc/joc_chicken_invaders_5_online_gratis.pdfIn PDF document text
- https://cdn.sqhk.co/tinolefowi/hK4hb98/41495094507.pdfIn PDF document text
- https://cdn.sqhk.co/serodozire/3gjchhT/99711883123.pdfIn PDF document text
- https://cdn.sqhk.co/sewoliwadumi/aidiN1A/megan_rapinoe_jersey_sales.pdfIn PDF document text
- https://cdn.sqhk.co/dederubap/hzjiAih/38500351843.pdfIn PDF document text
- https://cdn.sqhk.co/dadirowuj/rhdG1NN/guidestone_insurance_login.pdfIn PDF document text
- https://cdn.sqhk.co/karadirimose/cjgxIO4/mortal_kombat_11_rambo_fatalities.pdfIn PDF document text
- https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/wovuzago.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/wiwamoxamo/rivafopagupazutuj.pdfIn PDF document text
- https://s3.amazonaws.com/zoxewudunigus/osmosis_worksheet_amoeba_sisters.pdfIn PDF document text
- https://s3.amazonaws.com/fuwawibu/gozosapixe.pdfIn PDF document text
- https://s3.amazonaws.com/lososimap/beyond_skyrim_bruma_special_edition.pdfIn PDF document text
- https://s3.amazonaws.com/xesigeze/zoom_g1on_patches_u2.pdfIn PDF document text
- https://s3.amazonaws.com/fasomusogapovi/chief_information_officer_job_description_nhs.pdfIn PDF document text
- https://s3.amazonaws.com/zuguvoxoki/87919667103.pdfIn PDF document text
- https://s3.amazonaws.com/mafavuzenoliki/bcbsil_claim_form.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_off0000f76b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF76B	5368 bytes
SHA-256: `5b8c2543a041e1651747b25e92e19b4a5a3094f03c39e70a2ed6762cada41794`
`font_01_sfnt_off000109a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A0	10520 bytes
SHA-256: `62cc42ddff602e3d5710a6b80d6eafd42d501dd3963e6eea0fdd50d885bb95f5`

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