PDF malware analysis — malicious · c4a19316b99fcb25

MALICIOUS

PDF

109.9 KB Created: 2021-05-18 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 3fb849f913b84da8000cecf67284b696 SHA-1: 8cf8a3d90bbcb61fbd0681708ee6ad34b7942959 SHA-256: c4a19316b99fcb25d6732a91021d44469ff39ef8890579fae09591e571791f17

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a ML classifier score of 0.997. It also features a PDF link farm with numerous external links, one of which is a suspicious URL (https://maypoin.ru/strik). The document body, though truncated and obfuscated, contains text related to 'Ehsaas program apply online 2021' and appears to be generated by wkhtmltopdf, suggesting a lure for online applications or programs. The presence of a 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://maypoin.ru/strik?utm_term=ehsaas+program+apply+online+2021 PDF link annotation
- https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/95e298.pdfIn PDF document text
- https://kolidazab.weebly.com/uploads/1/3/4/6/134663239/658b04cfca05.pdfIn PDF document text
- https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/ef346.pdfIn PDF document text
- http://nujiwuwuxazasu.iblogger.org/liwevuvalam.pdfIn PDF document text
- https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/35327ba.pdfIn PDF document text
- http://wexakevo.22web.org/apache_hive_book.pdfIn PDF document text
- https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/d6dc839110f0.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/muwemivumazulax/panakebidenitobof.pdfIn PDF document text
- https://s3.amazonaws.com/xurixado/ocean_eyes_easy_piano_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/daraniwekamidir/gajilotoribenomaj.pdfIn PDF document text
- https://s3.amazonaws.com/sukobogixe/restrictive_cardiomyopathy_treatment_guidelines.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bcbdce2c-6215-4a38-894f-91c14d44bfe5/how_to_make_a_very_simple_origami_flower.pdfIn PDF document text
- https://s3.amazonaws.com/wajufifenoxuj/danimuso.pdfIn PDF document text
- https://s3.amazonaws.com/simujix/what_is_the_conflict_in_a_thousand_splendid_suns.pdfIn PDF document text
- https://s3.amazonaws.com/xafaxotaful/catholic_answers_relevant_radio.pdfIn PDF document text
- http://nawexox.epizy.com/fodonodolutusuliresu.pdfIn PDF document text
- http://povujijizota.epizy.com/autodock_vina_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f2f53a37-eb79-4413-bccd-e1cc8d80bb51/how_to_diagnose_car_ac_system.pdfIn PDF document text
- http://nofifejagarenut.epizy.com/tenancy_agreement_form_template.pdfIn PDF document text
- https://s3.amazonaws.com/bewibiwat/mi_pequeo_vampiro_pelicula_completa_en_espaol_2000.pdfIn PDF document text
- https://s3.amazonaws.com/serogajugomiji/18131241558.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bdde4601-fed6-4be8-bb92-9fcafe36c488/21733824179.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fde00276-b2f2-4df9-b4ea-de3d8857490f/how_much_is_1_cad_in_inr.pdfIn PDF document text
- https://s3.amazonaws.com/wewuxuviwar/lupejilulal.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/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_006_off0001771b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1771B	29056 bytes
SHA-256: `a74c7f7f09bb68eacb2848678a88caceb2927f202d965a09aadee694dd22d6b1`
`font_00_sfnt_off00012880.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12880	7388 bytes
SHA-256: `e5f96fa7911eeda6a065bba34119ca6f158363eb50dd7219307e5a128803c75d`
`font_01_sfnt_off00013b9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B9F	5620 bytes
SHA-256: `fed3c513e07dba488c06d646b25de2bcd657e19c3fa1eaf07e81b65b113613da`
`font_02_sfnt_off00014ea0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14EA0	11864 bytes
SHA-256: `06ccd3aec1528923cdef270d7d6307748248b74a14d2853dedf032884cad8a0d`

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