Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ffefa9ee6ac8aa…

MALICIOUS

PDF

102.0 KB Created: 2021-06-02 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ad21480170265bf3c3fc4e36479557 SHA-1: 21ebba7565f42b78293a8275ef3d6cd4046ea563 SHA-256: b0ffefa9ee6ac8aa5a1dfec8077458813c21e6dbb67f5419cfe8a0cbf43e707f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting or unknown domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://smidgel.ru/pbw?utm_term=not+that+meaning+in+urdu
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/632433.pdf
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/8498014.pdf
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/7075412.pdf
    • https://cdn-cms.f-static.net/uploads/4375196/normal_606e1c26ce7df.pdf
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/rizana-putapo-jijowifonig.pdf
    • https://jimakujomeda.weebly.com/uploads/1/3/4/4/134438408/jopolupi-pulasirolaxizex.pdf
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fe5bd5d92570.pdf
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/d18a1b2b.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_601564e0c0713.pdf
    • https://cdn-cms.f-static.net/uploads/4459777/normal_60344f4f783e5.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/xevajomirow.pdf
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/munexarimatogizu.pdf
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/b7f61b40f4.pdf
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/sadudusip-busuwepigozudi-migufevonoz.pdf
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5ff88a0457a68.pdf
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/d6598950.pdf
    • https://xonufukagupunim.weebly.com/uploads/1/3/1/3/131384400/9fc56cbe52c051d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/c12efda6-d295-4d13-a35a-17d1c33b1743/the_boy_in_the_striped_pajamas_chapter_4-6_summary.pdf
    • https://uploads.strikinglycdn.com/files/ddceca73-9207-4b53-9604-f6fd975781d7/behringer_xenyx_1202_usb_manual.pdf
    • http://vimadutukad.pbworks.com/f/67872252872.pdf
    • http://nukuxim.pbworks.com/w/file/fetch/144487545/covid-19_medical_certificate_format_download.pdf
    • https://uploads.strikinglycdn.com/files/ec68fcfb-5095-4aa8-960c-7cc7756073f9/kowufemoxuzibo.pdf
    • http://zilebunod.pbworks.com/f/4460111810.pdf
    • https://uploads.strikinglycdn.com/files/3437b38f-c752-49ca-a3ff-4eb5556b2c78/libro_de_historia_de_mexico_2_grado_de_secundaria.pdf
    • http://gitefov.pbworks.com/f/xujewigetofugalo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015422.bin
e24a658711b14c77c1fcd288ee92da7f3a0f0216fe57c30ea2261f805add48b8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15422 20012 bytes
font_00_sfnt_off00011c48.bin
e5ad4d76c780319445b303329b0dce4b0abed9cb23c5b2acd06d214b343cd4a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 5000 bytes
font_01_sfnt_off00012d1d.bin
3c81ac0959e0b7ca6dfbe870740d216673b14552758603481a7715da1f05d37d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 11416 bytes
font_03_sfnt_off0001758c.bin
44f365e5b5c83095337b3a082c8ae9e8c270c4750afbb01749f79cbf7f4b476f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1758C 5104 bytes