PDF malware analysis — malicious · cfdfe17b77c45da5

MALICIOUS

PDF

89.4 KB Created: 2021-05-10 02:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 75350d20d07ed3354a858c301138171c SHA-1: 911176b2ff398153c9a2642419a9160069930b77 SHA-256: cfdfe17b77c45da596f685f1821ef0fbb6350ba34a7f9a1f368d6723f00c83f3

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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 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://mezovuduw.ru/strik?utm_term=how+to+fourier+transform PDF link annotation
- https://cdn.sqhk.co/fojevimexu/XUhbijd/9th_class_admission_form_bise_lahore.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449769/normal_6050d2ea5d8fe.pdfIn PDF document text
- https://cdn.sqhk.co/murafabu/hfig0ie/12821564729.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378410/normal_6050454258958.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375353/normal_5fd0a6b6c04b4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413225/normal_606827af47b6d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4482617/normal_5fe27a7354c68.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/41de5765-182b-4db1-97bc-d0d27e9999d7/21996802825.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b60077c4-c223-4790-9c76-4616a5219769/how_long_is_sat_math_2.pdfIn PDF document text
- http://potutefi.rf.gd/paraphrasing_exercises_high_school.pdfIn PDF document text
- https://s3.amazonaws.com/fejenijovekozu/samsung_ue32eh5000_review.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b774f0d3-5702-4615-a7d6-0e2ede422693/48357007945.pdfIn PDF document text
- http://zezegakaj.rf.gd/palolijogajilisodepowof.pdfIn PDF document text
- http://divapikej.rf.gd/how_to_learn_formulas_fast.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/84e11a43-a946-4f55-8cfa-93b1562c2373/best_decision_tree_algorithm_in_r.pdfIn PDF document text
- https://s3.amazonaws.com/ladiwuzetawedi/44220085612.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/c354ec50-dcc0-45ff-b8c5-97d6bc8125c9/how_to_reset_master_code_on_dsc_alarm.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/06ce61df-4c8e-4d25-9257-06a523270c90/85256153253.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/297d4385-5af0-4b17-ad47-2ef61ec2defd/josep.pdfIn PDF document text
- http://walorute.rf.gd/90273570731.pdfIn PDF document text
- https://s3.amazonaws.com/lezerawe/alan_walker_darkside_free.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f900.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF900	4936 bytes
SHA-256: `70e323221e58fb418da6d9290ef6be534c3c29efc6e3bbc411a951a17f7a0b3c`
`font_01_sfnt_off000109ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109BA	4132 bytes
SHA-256: `d2ed323bb2db9fbdaa5a81d42c94a747907aa6be8c299b497bedf9e937750087`
`font_02_sfnt_off00011955.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11955	11460 bytes
SHA-256: `6d02835341ceba34a716b725bca6a9ce2c24302e2ef712914a6e6069e2033897`
`font_03_sfnt_off00014090.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14090	16860 bytes
SHA-256: `a4afbb9fb8d7f09f49cf288245a0af4dd24b2dccaec8a832a2ba24cfca9cb392`

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