Malicious PDF — malware analysis report

Static analysis result for SHA-256 4788bca663178bb7…

MALICIOUS

PDF

74.1 KB Created: 2021-01-11 23:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 09cd0fcee11d1c333db427a6a57dc377 SHA-1: 9ce2e9470fdbb85167943c325d01b06407fe91ed SHA-256: 4788bca663178bb73336f71d5738adf1e270ef3298af2a005ea11043b211502a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to interview questions, a common lure for phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffking.ru/aws?utm_term=job+exit+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/kosenopelid/abk4gfC/how_to_sew_a_skirt_without_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/dWZmjcC/dead_ninja_mortal_shadow_2_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_5fad9861c903f.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/P5HPhjy/game_4x4_off_road_rally_7_mod.pdfIn PDF document text
    • https://site-1167928.mozfiles.com/files/1167928/winolejawa.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/17563d38f77.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/cwqhits/words_in_battle.pdfIn PDF document text
    • https://bipikutifegex.weebly.com/uploads/1/3/4/8/134868884/sabulo.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/2fghOvL/mega_virtual_mixer_dj_studio_apk.pdfIn PDF document text
    • https://site-1176821.mozfiles.com/files/1176821/sajorokupet.pdfIn PDF document text
    • https://pigupapizot.weebly.com/uploads/1/3/4/4/134480908/4872075.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/toguvaju/misibufezulunofumuja.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/allview_x4_soul_infinity_l_android_8.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/47535592532.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.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5260 bytes
SHA-256: 5f4c9f7076d85c399836813690c84eba6af0798e4c7645e6ae3002195550e997
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10544 bytes
SHA-256: 4a788f69ed52c01bf21504a53fbebeb293152dc6a1dc09722f22f2b55eb5f2f4

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