PDF malware analysis — malicious · a8368a5c7003d9bc

MALICIOUS

PDF

133.3 KB Created: 2021-03-16 04:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 771dfd8f55f9cdccc255b0490fb4b1c7 SHA-1: 663138f7d7b87d175a1ed8249d69756f838973b2 SHA-256: a8368a5c7003d9bc0f88503af042d31ae719c115ab60a61dd1069a58a3499a69

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of embedded URLs and the nature of the link farm indicate a spearphishing attachment attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 6

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.
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://gimoguvi.ru/strik?utm_term=the+last+lecture+chapter+33+summary PDF link annotation
- https://cdn.sqhk.co/ravusigi/ahf2hjd/twitter_logo_transparent_background_png.pdfIn PDF document text
- https://cdn.sqhk.co/kojogitu/j7gfgjI/mawivovajubumod.pdfIn PDF document text
- https://cdn.sqhk.co/bomemenun/yhizkjd/android_move_apps_to_sd_card_not_working.pdfIn PDF document text
- https://cdn.sqhk.co/tirinakiweda/exjgVie/sisters_thai_menu_fairfax_va.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387819/normal_60243b131c892.pdfIn PDF document text
- https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/bed2a3f931cc5a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4463286/normal_6009e1bf1da6a.pdfIn PDF document text
- http://gosasumimak.iblogger.org/49553233522.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368240/normal_5fd27b9cad8e4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423443/normal_6035cd118ceb8.pdfIn PDF document text
- https://cdn.sqhk.co/zinoliwomi/hMsAVKZ/pofale.pdfIn PDF document text
- https://veraweno.weebly.com/uploads/1/3/0/7/130739577/4091535.pdfIn PDF document text
- https://giliruba.weebly.com/uploads/1/3/1/4/131483170/nojazufaxikodudoluv.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375531/normal_6025fa717091b.pdfIn PDF document text
- https://bimeriwuju.weebly.com/uploads/1/3/4/9/134901074/aeea5.pdfIn 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/a8eb7af5-d0a3-452a-9d33-99f9120dcfeb/do_androids_dream_of_electric_sheep_shmoop.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0e1bf904-9651-478f-9192-827cc77fcad5/14751812489.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/10fb1b2b-8b6b-4db1-9ae7-428483be6ac6/53615126191.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/15ea2080-034f-44ea-9ee3-32897f343be4/onn_wireless_keyboard_and_mouse_not_working.pdfIn PDF document text
- http://wajiletum.epizy.com/crossfire_philippines_free_for_pc.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001be38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BE38	5008 bytes
SHA-256: `5ca70e1b74d319ecd1bf2083fe38d2a35b4bba5813212b9d8fb1f54b699061d8`
`font_01_sfnt_off0001cf48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1CF48	12416 bytes
SHA-256: `afe738eac36f28b0390547312d544c1672b24ef5a38d6cc6806b6fe3d94e60c0`
`font_02_sfnt_off0001f991.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F991	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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